3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array(array(1, 2, 3), array(4, 5, 6)); $result = array_reduce($array, 'array_merge', array()); print_r($result);
Output for 5.6.0 - 5.6.26, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 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
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )
preferences:
97.82 ms | 1640 KiB | 4 Q