3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('a' => 'a', 'b' => 'b', 'z' => array('c' => 'c', 'd' => 'd')); $b = array('a' => 'c', 'z' => array('c' => 'e')); var_dump(array_merge_recursive($a, $b));

preferences:
51.18 ms | 402 KiB | 5 Q