Fatal error: Uncaught Error: [] operator not supported for strings in /wp-content/plugins/revslider/inc_php/framework/base_admin.class.php:73 with PHP 7 and code using the empty-index array push syntax Solution: Add line $arrMetaBoxes = []; // creates an array Line 73 self::$arrMetaBoxes[] = $box; In revslider/includes/framework/base-admin.class.php, I changed the following line private static $arrMetaBoxes = ”; //option boxes…