3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array1 = array( 1 => array('stuff'), 2 => array('stuff'), ); $array2 = array( 1 => array('other stuff'), 3 => array('other stuff'), ); print_r(array_merge($array1, $array2)); print_r($array1 + $array2);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => Array ( [0] => stuff ) [1] => Array ( [0] => stuff ) [2] => Array ( [0] => other stuff ) [3] => Array ( [0] => other stuff ) ) Array ( [1] => Array ( [0] => stuff ) [2] => Array ( [0] => stuff ) [3] => Array ( [0] => other stuff ) )

preferences:
253.13 ms | 406 KiB | 403 Q