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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace GeminiLabs\Pollux\MetaBox;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use GeminiLabs\Pollux\Application;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use GeminiLabs\Pollux\Component;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use GeminiLabs\Pollux\MetaBox\Instruction;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use GeminiLabs\Pollux\MetaBox\Validator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use RecursiveArrayIterator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use RecursiveIteratorIterator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait Instruction  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return void  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	protected function addInstructions()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	{ | 
            
            
                                                                        
                            
            
                                    
            
            
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                		if( !count( array_filter( $this->metaboxes, function( $metabox ) { | 
            
                            
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                			return $this->show( false, $metabox );  | 
            
                            
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                		})))return;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$this->metaboxes[] = [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			'id' => 'infodiv',  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			'post_types' => $this->getPostTypes(),  | 
            
                            
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                			'title' => __( 'How to use in your theme', 'pollux' ),  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			'context' => 'side',  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			'priority' => 'low',  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			'fields' => [[  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				'slug' => '',  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				'std' => $this->generateInstructions(),  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				'type' => 'custom_html',  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			]],  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function generateInstructions()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	{ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return array_reduce( $this->getInstructions(), function( $html, $metabox ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$fields = array_reduce( array_column( $metabox['fields'], 'slug' ), function( $html, $slug ) use( $metabox ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$hook = sprintf( 'pollux/%s/instruction', $this->getClassname() );  | 
            
                            
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                				return $html . apply_filters( $hook, "PostMeta::get('{$slug}');", $slug, $metabox['slug'] ) . PHP_EOL; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			});  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $html . sprintf( '<p><strong>%s</strong></p><pre class="my-sites nav-tab-active misc-pub-section">%s</pre>',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$metabox['title'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$fields  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		});  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function getInstructions()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	{ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return array_filter( $this->metaboxes, function( $metabox ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->validate( $metabox['condition'] )  | 
            
                            
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                				&& $this->hasPostType( $metabox );  | 
            
                            
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                		});  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: