note 129096 added to function.array-key-first

A polyfill serves the purpose of retroactively incorporating new features from PHP releases into older PHP versions, ensuring API compatibility. In PHP 7.3.0, the array_key_first() function was introduced, demonstrated in the following example: <?php $array = [ 'first_key' => 'first_value', 'second_key' => 'second_value', ]; var_dump(array_key_first($array)); ?> The provided polyfill in this documentation allows the convenient use of array_key_first() with API compatibility in PHP versions preceding PHP 7.3.0, where the function was not implemented: <?php if (!function_exists('array_key_first')) { function array_key_first(array $arr) { foreach ($arr as $key => $unused) { return $key; } return null; } } $array = [ 'first_key' => 'first_value', 'second_key' => 'second_value', ]; var_dump(array_key_first($array)); ?> ---- Server IP: 45.112.84.4 Probable Submitter: 45.91.157.134 (proxied: 2a02:8440:d109:5ad1:1b18:f4a7:568c:4465) ---- Manual Page -- https://php.net/manual/en/function.array-key-first.php Edit -- https://main.php.net/note/edit/129096 Del: integrated -- https://main.php.net/note/delete/129096/integrated Del: useless -- https://main.php.net/note/delete/129096/useless Del: bad code -- https://main.php.net/note/delete/129096/bad+code Del: spam -- https://main.php.net/note/delete/129096/spam Del: non-english -- https://main.php.net/note/delete/129096/non-english Del: in docs -- https://main.php.net/note/delete/129096/in+docs Del: other reasons-- https://main.php.net/note/delete/129096 Reject -- https://main.php.net/note/reject/129096 Search -- https://main.php.net/manage/user-notes.php