51423: wp-admin/includes/plugin.php: PHP 8.0 compatibility fix. #728
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`list_files` might return `false`, which will produce a type error in PHP 8.0 when used in the `array_map` call.
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list_filesmight returnfalse, which will produce a type error in PHP 8.0 when used in thearray_mapcall.Trac ticket: https://core.trac.wordpress.org/ticket/51423
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.