3v4l.org

run code in 500+ PHP versions simultaneously
<?php $foo = [ 'bar' => null ]; var_dump(array_key_exists('bar', $foo)); var_dump(isset($foo['bar']));
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
bool(true) bool(false)
preferences:
111.27 ms | 1448 KiB | 4 Q