Files
wordpress/wp-includes
hellofromTonya df4834caea Widgets: Use isset() in WP_Widget:: display_callback() to support ArrayIterator and ArrayObject.
[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.
Built from https://develop.svn.wordpress.org/trunk@52173


git-svn-id: http://core.svn.wordpress.org/trunk@51765 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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