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                abstract class Jetpack_Tiled_Gallery_Item { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public $image;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	public function __construct( $attachment_image, $needs_attachment_link, $grayscale ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$this->image = $attachment_image;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$this->grayscale = $grayscale;  | 
            
                            
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                		$this->image_title = $this->image->post_title;  | 
            
                            
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                		$this->image_alt = get_post_meta( $this->image->ID, '_wp_attachment_image_alt', true );  | 
            
                            
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                		// If no Alt value, use the caption  | 
            
            
                                                                        
                            
            
                                                                    
                                                                                                        
            
            
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                		if ( empty( $this->image_alt ) && ! empty( $this->image->post_excerpt ) ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                			$this->image_alt = trim( strip_tags( $this->image->post_excerpt ) );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		// If still no Alt value, use the title  | 
            
            
                                                                        
                            
            
                                                                    
                                                                                                        
            
            
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                		if ( empty( $this->image_alt ) && ! empty( $this->image->post_title ) ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                			$this->image_alt = trim( strip_tags( $this->image->post_title ) );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$this->orig_file = wp_get_attachment_url( $this->image->ID );  | 
            
                            
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                		$this->link = $needs_attachment_link ? get_attachment_link( $this->image->ID ) : $this->orig_file;  | 
            
                            
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                		// If h and w are the same, there's a reasonably good chance the image will need cropping to avoid being stretched.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$crop = $this->image->height == $this->image->width ? true : false;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$this->img_src = jetpack_photon_url( $this->orig_file, array(  | 
            
                            
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                			'w'    => $this->image->width,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			'h'    => $this->image->height,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			'crop' => $crop  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		) );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function fuzzy_image_meta() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$meta = wp_get_attachment_metadata( $this->image->ID );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$img_meta = ( ! empty( $meta['image_meta'] ) ) ? (array) $meta['image_meta'] : array();  | 
            
            
                                                                                                            
                            
            
                                                                    
                                                                                                        
            
            
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                		if ( ! empty( $img_meta ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			foreach ( $img_meta as $k => $v ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				if ( 'latitude' == $k || 'longitude' == $k )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                					unset( $img_meta[$k] );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $img_meta;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function meta_width() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$meta = wp_get_attachment_metadata( $this->image->ID );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return isset( $meta['width'] ) ? intval( $meta['width'] ) : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function meta_height() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$meta = wp_get_attachment_metadata( $this->image->ID );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return isset( $meta['height'] ) ? intval( $meta['height'] ) : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function medium_file() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$medium_file_info = wp_get_attachment_image_src( $this->image->ID, 'medium' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$medium_file      = isset( $medium_file_info[0] ) ? $medium_file_info[0] : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $medium_file;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function large_file() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$large_file_info  = wp_get_attachment_image_src( $this->image->ID, 'large' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$large_file       = isset( $large_file_info[0] ) ? $large_file_info[0] : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $large_file;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Jetpack_Tiled_Gallery_Rectangular_Item extends Jetpack_Tiled_Gallery_Item { | 
            
                            
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                	public function __construct( $attachment_image, $needs_attachment_link, $grayscale ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		parent::__construct( $attachment_image, $needs_attachment_link, $grayscale );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->img_src_grayscale = jetpack_photon_url( $this->img_src, array( 'filter' => 'grayscale' ) );  | 
            
                            
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                		$this->size = 'large';  | 
            
                            
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                		if ( $this->image->width < 250 )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->size = 'small';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Jetpack_Tiled_Gallery_Square_Item extends Jetpack_Tiled_Gallery_Item { | 
            
                            
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                	public function __construct( $attachment_image, $needs_attachment_link, $grayscale ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		parent::__construct( $attachment_image, $needs_attachment_link, $grayscale );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->img_src_grayscale = jetpack_photon_url( $this->img_src, array( 'filter' => 'grayscale', 'resize' => array( $this->image->width, $this->image->height ) ) );  | 
            
                            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Jetpack_Tiled_Gallery_Circle_Item extends Jetpack_Tiled_Gallery_Square_Item { | 
            
                            
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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: