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In PHP 7.3, the `compact()` function has been changed to issue an `E_NOTICE` level error if a passed string refers to an unset variable. In previous versions of PHP, this notice was silently skipped. This fixes a few more instances of unset variables in the WordPress admin. The full RFC can be viewed here: https://wiki.php.net/rfc/compact. See #44416. Fixes #45483. Built from https://develop.svn.wordpress.org/branches/5.0@44185 git-svn-id: http://core.svn.wordpress.org/branches/5.0@44015 1a063a9b-81f0-0310-95a4-ce76da25c4cd