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 that will be added to post
to:
private static $arrMetaBoxes = array(); //option boxes that will be added to post