3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [1,2,3,4]; $b = [1,2,3,4, 55 => 5]; unset($b[55]); $a[] = 5; $b[] = 5; var_dump($a, $b); assert($a === $b);

preferences:
101.89 ms | 1637 KiB | 5 Q