Sergey Biryukov 99fd93c7df Administration: Require a valid action parameter to be set for admin-ajax.php requests. ...

This avoids `Array to string conversion` PHP notices when an array is passed as the `action` parameter.

Additionally, send an appropriate HTTP response status code when an invalid action is passed to `admin-post.php`.

Follow-up to [13175], [19738], [41120], [41926].

Props dd32.
Fixes #55212.

git-svn-id: https://develop.svn.wordpress.org/trunk@52813 602fd350-edb4-49c9-b593-d223f7449a82

2022-03-02 14:58:09 +00:00

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