(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
key_exists — Alias di array_key_exists()
Questa funzione รจ sinonimo di: array_key_exists().
The key_exists() function has never been deprecatedhttps://bugs.php.net/bug.php?id=71174
Deprecated alias, don't use it. Will get removed sooner or later.