3v4l.org

run code in 500+ PHP versions simultaneously
<?php $array = [ 'a', 'b' ]; var_dump( array_key_exists(0, $array) );
Output for 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
bool(true)
preferences:
60 ms | 869 KiB | 4 Q