Wordpress patch a missing JPG in image tag on save

patch-missing-jpg

/* 
 * Patch missing JPG from img
 * @param int     $post_ID      Post ID.
 * @param WP_Post $post_after   Post object following the update.
 */
function kia_patch_missing_img_tags( $post_id, $post ) {
    // If this is a revision, get real post ID
    if ( $parent_id = wp_is_post_revision( $post_id ) ) {
        $post_id = $parent_id;
    }

    
	$content = $post->post_content;

	// Matching borrowed from https://wordpress.stackexchange.com/a/162405/6477
	// we need a expression to match things
	$regex = '/src="([^"]*)"/';
	// we want all matches
	preg_match_all( $regex, $content, $matches );
	// reversing the matches array
	$matches = array_reverse($matches);

	$needs_update = false;
 
 	if( $matches ) {

 		foreach( $matches[0] as $match ) {

 			// Skip the matches that have a trailing jpg or png
 			if( strrpos( $match, '.jpg' ) !== false || strrpos( $match, '.png' ) !== false ) {
 				continue;
 			}

 			$needs_update = true;

 			// We presume we found an image tag with no trailing image type
 			$content = str_replace( $match, $match . '.jpg', $content );
 	
 		}

 		if( $needs_update ) {
 			 // unhook this function so it doesn't loop infinitely
			remove_action( 'save_post', 'kia_patch_missing_img_tags', 10, 2 );
 
        	// update the post, which calls save_post again
   		    wp_update_post( array( 'ID' => $post_id, 'post_content' => $content ) );
 
	        // re-hook this function
	        add_action( 'save_post', 'kia_patch_missing_img_tags', 10, 2 );
 		}


 	}
 	//wp_die(var_dump($matches));


       

}
add_action( 'save_post', 'kia_patch_missing_img_tags', 10, 2 );