post_content ) ) add_post_meta( $post_id, '_filtered_diff', $content ); else delete_post_meta( $post_id, '_filtered_diff' ); return false; } return true; } /** * Filter function that alters the admin message to include the diff stored in _filtered_diff post meta * * @param string $message the message text that should be altered. text is appended to the message * @return string the altered message */ function print_post_diff( $message = '' ) { global $post; if ( $diff = get_post_meta( $post->ID, '_filtered_diff' ) ) delete_post_meta( $post->ID, '_filtered_diff' ); // make sure we show it only once if( !is_array( $diff ) ) return $message; $diff_txt = array_pop($diff); if ( empty( $diff_txt ) ) // should not happen, but who knows return $message; return $message . '

' . __( 'Parts of your post have been altered. Usually this happens due to filtering prohibited or insecure code such as embedded scripts from your content.' ) . '

' . __( 'See the changes below :' ) . '

' . $diff_txt . '

'; } /** * Initialize filters and actions. */ function init_admin_post_diff() { add_filter( 'post_admin_message', 'print_post_diff', 10 ); add_action( 'pre_post_redirect', 'check_post_diff', 10, 1); add_filter( 'page_admin_message', 'print_post_diff', 10 ); add_action( 'pre_page_redirect', 'check_post_diff', 10, 1); } add_action( 'init', 'init_admin_post_diff' ); ?>