Find base64 images embedded in the post_content, download the image, sideload the image, and replace the base64 with the image file path and update the post_content

gistfile1.txt

 	global $wpdb; 
 
 	$requested_posts = $wpdb->get_results( "SELECT * FROM `wp_posts` WHERE `wp_posts`.`post_status` = 'publish' AND `wp_posts`.`post_type` = 'post' AND post_content LIKE '%base64%' LIMIT 9999999"); 
 
	 $args = array(
	 	'posts_per_page'   => -1,
	 	'post_type'        => 'post',
	 	'post_status'      => 'publish',
	 );

	$updated = array();
 	$unique_related_imgReplace = array();

	 // get all posts in the features post type
	$new_query = array(); 
 	$file_returned_array = array();

	foreach ( $requested_posts as $post) {
		$count = 0; 
		
 		update_post_meta($post->ID, '_backedup_post_content', $post->post_content); 
 		
 		$callback = function($matches) use (&$post, &$count){
 	  		
			$code = $matches[1]; 
			$count++;
			$decoded   = base64_decode($code) ;
			$filename  = $post->post_name.'_img_'.$count.'.jpg';
			
			$hashed_filename  = md5( $filename . microtime() ) . '_' . $filename;
			
			$upload_dir = wp_upload_dir();
			
			$upload_path = $upload_dir['basedir'].'/tmp/';
			
			$image_upload  = file_put_contents( $upload_path . $hashed_filename, $decoded );
			
			$file_info[$post->ID]['filename'] = $filename; 
			$file_info[$post->ID]['upload_dir'] = $upload_dir; 
			$file_info[$post->ID]['hashed'] = $hashed_filename; 
			$file_info[$post->ID]['image_upload'] = $image_upload; 
			$file_info[$post->ID]['upload_path']= $upload_path; 
			
			$file_array = array(); 
			$file_array['error'] = 0;
			$file_array['name'] = basename($filename); 
			$file_array['tmp_name'] = $upload_path.$hashed_filename; 
			$file_array['type']     = 'image/jpg';
			$file_array['size']     = filesize( $upload_path . $hashed_filename );
			
			//HANDLE UPLOADED FILE
			
			require_once( ABSPATH . 'wp-admin/includes/file.php' );
		    require_once(ABSPATH . '/wp-admin/includes/media.php');
			require_once(ABSPATH . 'wp-admin/includes/image.php');
			
			$attachment_data = array(
				'post_title' => basename($filename),
			); 
		
			$file_return = media_handle_sideload( $file_array, $post->ID, null, $attachment_data  );
			$file_returned_array[$post->ID][] = $file_return; 
			
			//if(	$file_return == 0 ){ wp_die(var_dump($file_return)); }		

			
			$attachment_url = wp_get_attachment_url( $file_return );	
			
			return $attachment_url;
 	  			
 	  	};

 		$replaced = preg_replace_callback('/data[^,]+(?<=base64),([^")]*)/', $callback, $post->post_content); 
 		
 		$my_post = array(
 		     'ID'           => $post->ID,
 		     'post_content' => $replaced,
 		 );
 		
 		wp_update_post( $my_post );

 	} // foreach features       
	
	$resp = array(
		'success' => true, 
		$file_returned_array
	); 
	wp_sent_json($resp);