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[33696] introduced support returning `ArrayIterator` and `ArrayObject` objects from `WP_Widget::get_settings()`. Per the PHP manual, `array_key_exists()` stopped supporting this in PHP 8.0.0 and deprecated in PHP 7.4.0. >For backward compatibility reasons, array_key_exists() will also return true if key is a property defined within an object given as array. This behaviour is deprecated as of PHP 7.4.0, and removed as of PHP 8.0.0. This commit uses `isset()` instead of `array_key_exists()` which is supported on all current versions of PHP. Includes unit tests. Ref: * https://www.php.net/manual/en/function.array-key-exists.php#refsect1-function.array-key-exists-notes Follow-up to [32602], [33696]. Props dlh, hellofromTonya, jrf, sergeybiryukov. Fixes #52728. git-svn-id: https://develop.svn.wordpress.org/trunk@52173 602fd350-edb4-49c9-b593-d223f7449a82