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Editing: specify-missing-image-dimensions.php

<?php
/*
Plugin Name: Specify Missing Image Dimensions
Description: A plugin that helps to add missing width and height attributes to images.
Author: WPHowKnow
Author URI: https://wphowknow.com/
Version: 1.0.2
Text Domain: specify-missing-image-dimensions
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
*/

if (!defined('ABSPATH')) {
    exit; // Exit if accessed directly
}

include( plugin_dir_path( __FILE__ ) . 'admin/admin-settings.php');

add_action('init', 'SMID_start_gathering_data' );

function SMID_start_gathering_data() {
    
	if( !is_admin() ) {
		ob_start( 'SMID_end_gathering_data');
	}
	
}

function SMID_end_gathering_data( $content ) {
	
	$set_images_regex = '<img(?:[^>](?!(height|width)=[\'\"](?:\S+)[\'\"]))*+>';
	
	preg_match_all( "/{$set_images_regex}/is", $content, $images_match );
	
	$images_to_replace_array = [];
	
	$images = $images_match[0];
	
	foreach ( $images as $image ) {

$image_url = SMID_get_image_url($image); // Get both type of URLs Full or Relative AND also handle layload attribute
	    
	    if( empty($image_url) ) {
	        continue;
	    }	    
	    
	    if( SMID_is_image_excluded_by_class($image) == true ) {
	        continue;
	    }
	    
	    if( SMID_is_image_excluded_by_id($image) == true ) {
	        continue;
	    }
	    
	    $image_url = SMID_relative_to_full_URL($image_url); // Convert Relative URLs to Full
	
	    if( $image_url == false ) {
	        continue;
	    }
	    
	    $image_extension = strtolower(pathinfo($image_url, PATHINFO_EXTENSION)); 
	    
	    if( SMID_is_image_excluded_by_extension($image_extension) == true ) {
	        continue;
	    }
	    
	    if( SMID_is_image_excluded_by_name($image_url) == true ) {
	        continue;
	    }
	    
		if( strtolower($image_extension) == 'svg' ) {
			$svgfile = simplexml_load_file($image_url);
	    	if( !empty($svgfile) ) {
		    	$xmlattributes = $svgfile->attributes();
		    	$sizes[3] = 'width="'.$xmlattributes->width.'" height="'.$xmlattributes->height.'"' ;
	    	}
		}
		else {
			$sizes = getimagesize( $image_url ); // Get image height and width
		}
	    
	    if( empty($sizes[3]) ) {
	        continue;
	    }
	
	    $images_to_replace_array[ $image ] = SMID_specify_image_width_height( $image, $sizes[3] );
	
	}
	
	return str_replace( array_keys( $images_to_replace_array ), $images_to_replace_array, $content );
	
}

function SMID_get_image_url( $image ) {
	
	$lazyload_attribute = strtolower(get_option('SMID_data_Src_Value')); // Get lazyload attribute
	
	if( empty($lazyload_attribute) ) {
	 
	    preg_match( '/\s+data-src\s*=\s*[\'"](?<url>[^\'"]+)/i', $image, $src_match );

if( !empty($src_match['url']) ) {
            return $src_match['url'];        
        }
    
    	preg_match( '/\s+src\s*=\s*[\'"](?<url>[^\'"]+)/i', $image, $src_match );
    	
    	if( !empty($src_match['url']) ) {
            return $src_match['url'];        
        }
    	    
	}
	
	else {
	    
	    preg_match( '/\s+'.$lazyload_attribute.'\s*=\s*[\'"](?<url>[^\'"]+)/i', $image, $src_match );

}

}

}

function SMID_specify_image_width_height( $image, $image_size ) {
	// Remove old width and height attributes if found.
	$modified_image = preg_replace( '/(height|width)=[\'"](?:\S+)*[\'"]/i', '', $image );
	$modified_image = preg_replace( '/<\s*img/i', '<img ' . $image_size, $modified_image );

if ( $modified_image === null ) {
		return $image;
	}
	
	return $modified_image;
}

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Editing: specify-missing-image-dimensions.php

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