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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                include_once ABSPATH . 'wp-admin/includes/file.php';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Jetpack_JSON_API_Plugins_Install_Endpoint extends Jetpack_JSON_API_Plugins_Endpoint { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	// POST /sites/%s/plugins/%s/install  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected $needed_capabilities = 'install_plugins';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected $action              = 'install';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function install() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $this->plugins as $index => $slug ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$skin      = new Jetpack_Automatic_Install_Skin();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$upgrader  = new Plugin_Upgrader( $skin );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$zip_url   = self::generate_wordpress_org_plugin_download_link( $slug );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$result = $upgrader->install( $zip_url );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ( ! $this->bulk && is_wp_error( $result ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				return $result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$plugin = self::get_plugin_id_by_slug( $slug );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$error_code = 'install_error';  | 
            
            
                                                                                                            
                            
            
                                                                    
                                                                                                        
            
            
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                View Code Duplication | 
                			if ( ! $plugin ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$error = $this->log[ $slug ]['error'] = __( 'There was an error installing your plugin', 'jetpack' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ( ! $this->bulk && ! $result ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$error_code = $upgrader->skin->get_main_error_code();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$message = $upgrader->skin->get_main_error_message();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$error = $this->log[ $slug ]['error'] = $message ? $message : __( 'An unknown error occurred during installation' , 'jetpack' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->log[ $plugin ][] = $upgrader->skin->get_upgrade_messages();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( ! $this->bulk && isset( $error ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ( 'download_failed' === $error_code ) { | 
            
                            
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                				// For backwards compatibility: versions prior to 3.9 would return no_package instead of download_failed.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$error_code = 'no_package';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return new WP_Error( $error_code, $this->log[ $slug ]['error'], 400 );  | 
            
                            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// replace the slug with the actual plugin id  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->plugins[ $index ] = $plugin;  | 
            
                            
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                		return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function validate_plugins() { | 
            
            
                                                                                                            
                            
            
                                                                    
                                                                                                        
            
            
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                View Code Duplication | 
                		if ( empty( $this->plugins ) || ! is_array( $this->plugins ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return new WP_Error( 'missing_plugins', __( 'No plugins found.', 'jetpack' ) );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach( $this->plugins as $index => $slug ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			// make sure it is not already installed  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ( self::get_plugin_id_by_slug( $slug ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				return new WP_Error( 'plugin_already_installed', __( 'The plugin is already installed', 'jetpack' ) );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected static function generate_wordpress_org_plugin_download_link( $plugin_slug ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return "https://downloads.wordpress.org/plugin/{$plugin_slug}.latest-stable.zip"; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected static function get_plugin_id_by_slug( $slug ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		/** This filter is documented in wp-admin/includes/class-wp-plugins-list-table.php */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$plugins = apply_filters( 'all_plugins', get_plugins() );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( ! is_array( $plugins ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach( $plugins as $plugin_file => $plugin_data ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ( self::get_slug_from_file_path( $plugin_file ) === $slug ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				return $plugin_file;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected static function get_slug_from_file_path( $plugin_file ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// Simular to get_plugin_slug() method.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$slug = dirname( $plugin_file );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( '.' === $slug ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$slug = preg_replace("/(.+)\.php$/", "$1", $plugin_file ); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $slug;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Allows us to capture that the site doesn't have proper file system access.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * In order to update the plugin.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Jetpack_Automatic_Install_Skin extends Automatic_Upgrader_Skin { | 
            
                            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Stores the last error key;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 **/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected $main_error_code = 'install_error';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Stores the last error message.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 **/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected $main_error_message = 'An unknown error occurred during installation';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Overwrites the set_upgrader to be able to tell if we e ven have the ability to write to the files.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param WP_Upgrader $upgrader  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	public function set_upgrader( &$upgrader ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                		parent::set_upgrader( $upgrader );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		// Check if we even have permission to.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$result = $upgrader->fs_connect( array( WP_CONTENT_DIR, WP_PLUGIN_DIR ) );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		if ( ! $result ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                			// set the string here since they are not available just yet  | 
            
            
                                                                        
                            
            
                                    
            
            
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                 | 
                			$upgrader->generic_strings();  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    126
                 | 
                                    
                                                     | 
                
                 | 
                			$this->feedback( 'fs_unavailable' );  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    127
                 | 
                                    
                                                     | 
                
                 | 
                		}  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    128
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    129
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    130
                 | 
                                    
                                                     | 
                
                 | 
                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    131
                 | 
                                    
                                                     | 
                
                 | 
                	 * Overwrites the error function  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    132
                 | 
                                    
                                                     | 
                
                 | 
                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    133
                 | 
                                    
                                                     | 
                
                 | 
                	public function error( $error ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                		if ( is_wp_error( $error ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                			$this->feedback( $error );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                	private function set_main_error_code( $code ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                		// Don't set the process_failed as code since it is not that helpful unless we don't have one already set.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                		$this->main_error_code = ( $code === 'process_failed' && $this->main_error_code  ? $this->main_error_code : $code );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                	private function set_main_error_message( $message, $code ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                		// Don't set the process_failed as message since it is not that helpful unless we don't have one already set.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                		$this->main_error_message = ( $code === 'process_failed' && $this->main_error_code ? $this->main_error_code : $message );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                	public function get_main_error_code() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                		return $this->main_error_code;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                	public function get_main_error_message() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                                                     | 
                
                 | 
                		return $this->main_error_message;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                	 * Overwrites the feedback function  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                	public function feedback( $data ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                		$current_error = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                		if ( is_wp_error( $data ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                                                     | 
                
                 | 
                			$this->set_main_error_code( $data->get_error_code() );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                			$string = $data->get_error_message();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                		} elseif ( is_array( $data ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                			return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                		} else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                			$string = $data;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    170
                 | 
                                    
                                                     | 
                
                 | 
                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    171
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    172
                 | 
                                    
                                                     | 
                
                 | 
                		if ( ! empty( $this->upgrader->strings[ $string ] ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    173
                 | 
                                    
                                                     | 
                
                 | 
                			$this->set_main_error_code( $string );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    174
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    175
                 | 
                                    
                                                     | 
                
                 | 
                			$current_error = $string;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    176
                 | 
                                    
                                                     | 
                
                 | 
                			$string = $this->upgrader->strings[ $string ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    177
                 | 
                                    
                                                     | 
                
                 | 
                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    178
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    179
                 | 
                                    
                                                     | 
                
                 | 
                		if ( strpos( $string, '%' ) !== false ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    180
                 | 
                                    
                                                     | 
                
                 | 
                			$args = func_get_args();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    181
                 | 
                                    
                                                     | 
                
                 | 
                			$args = array_splice( $args, 1 );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    182
                 | 
                                    
                                                     | 
                
                 | 
                			if ( ! empty( $args ) )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    183
                 | 
                                    
                                                     | 
                
                 | 
                				$string = vsprintf( $string, $args );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    184
                 | 
                                    
                                                     | 
                
                 | 
                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    185
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    186
                 | 
                                    
                                                     | 
                
                 | 
                		$string = trim( $string );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    187
                 | 
                                    
                                                     | 
                
                 | 
                		$string = wp_kses( $string, array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    188
                 | 
                                    
                                                     | 
                
                 | 
                			'a' => array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    189
                 | 
                                    
                                                     | 
                
                 | 
                				'href' => true  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    190
                 | 
                                    
                                                     | 
                
                 | 
                			),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    191
                 | 
                                    
                                                     | 
                
                 | 
                			'br' => true,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    192
                 | 
                                    
                                                     | 
                
                 | 
                			'em' => true,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    193
                 | 
                                    
                                                     | 
                
                 | 
                			'strong' => true,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    194
                 | 
                                    
                                                     | 
                
                 | 
                		) );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    195
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    196
                 | 
                                    
                                                     | 
                
                 | 
                		$this->set_main_error_message( $string, $current_error );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    197
                 | 
                                    
                                                     | 
                
                 | 
                		$this->messages[] = $string;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    198
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    199
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    200
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: