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                <?php //phpcs:ignore WordPress.Files.FileName.InvalidClassFileName  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Components Library  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Load and display a pre-rendered component  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Jetpack_Components { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Load and display a pre-rendered component  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @since 7.7.0  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param string $name  Component name.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param array  $props Component properties.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return string The component markup  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	public static function render_component( $name, $props ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$rtl = is_rtl() ? '.rtl' : '';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		wp_enqueue_style( 'jetpack-components', plugins_url( "_inc/blocks/components{$rtl}.css", JETPACK__PLUGIN_FILE ), array( 'wp-components' ), JETPACK__VERSION ); | 
            
            
                                                                        
                            
            
                                    
            
            
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                		ob_start();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		// `include` fails gracefully and throws a warning, but doesn't halt execution.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		include JETPACK__PLUGIN_DIR . "_inc/blocks/$name.html";  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$markup = ob_get_clean();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		foreach ( $props as $key => $value ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                			$markup = str_replace(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				"#$key#",  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				$value,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				$markup  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			// Workaround, required to replace strings in `sprintf`-expressions.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			// See extensions/i18n-to-php.js for more information.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			$markup = str_replace(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				"%($key)s",  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				$value,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				$markup  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		return $markup;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Load and display a pre-rendered component  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @since 7.7.0  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param array $props Component properties.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return string The component markup  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public static function render_upgrade_nudge( $props ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$plan_slug = $props['plan'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		jetpack_require_lib( 'plans' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$plan = Jetpack_Plans::get_plan( $plan_slug );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( ! $plan ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return self::render_component(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				'upgrade-nudge',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                					'planName'   => __( 'a paid plan', 'jetpack' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                					'upgradeUrl' => '',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// WP.com plan objects have a dedicated `path_slug` field, Jetpack plan objects don't  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// For Jetpack, we thus use the plan slug with the 'jetpack_' prefix removed.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$plan_path_slug = wp_startswith( $plan_slug, 'jetpack_' )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			? substr( $plan_slug, strlen( 'jetpack_' ) )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			: $plan->path_slug;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$post_id   = get_the_ID();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$post_type = get_post_type();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// The editor for CPTs has an `edit/` route fragment prefixed.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$post_type_editor_route_prefix = in_array( $post_type, array( 'page', 'post' ), true ) ? '' : 'edit';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( method_exists( 'Jetpack', 'build_raw_urls' ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$site_slug = Jetpack::build_raw_urls( home_url() );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		} elseif ( class_exists( 'WPCOM_Masterbar' ) && method_exists( 'WPCOM_Masterbar', 'get_calypso_site_slug' ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$site_slug = WPCOM_Masterbar::get_calypso_site_slug( get_current_blog_id() );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// Post-checkout: redirect back to the editor.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$redirect_to = ( defined( 'IS_WPCOM' ) && IS_WPCOM )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			? '/' . implode( '/', array_filter( array( $post_type_editor_route_prefix, $post_type, $site_slug, $post_id ) ) )  | 
            
                            
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                			: add_query_arg(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                					'action' => 'edit',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                					'post'   => $post_id,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				admin_url( 'post.php' )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$upgrade_url =  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$plan_path_slug  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			? add_query_arg(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				'redirect_to',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$redirect_to,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				"https://wordpress.com/checkout/${site_slug}/${plan_path_slug}" | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			) : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return self::render_component(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'upgrade-nudge',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				'planName'   => $plan->product_name,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				'upgradeUrl' => $upgrade_url,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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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: