3v4l.org

run code in 300+ PHP versions simultaneously
<?php $results = array( array( array('foo1'), array('foo2'), ), array( array('bar1'), array('bar2'), ), ); $rows = call_user_func_array('array_merge', $results); print_r($rows); print_r(array_merge($results[0], $results[1]));
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 - 5.6.38, 7.0.0 - 7.0.32, 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] => foo1 ) [1] => Array ( [0] => foo2 ) [2] => Array ( [0] => bar1 ) [3] => Array ( [0] => bar2 ) ) Array ( [0] => Array ( [0] => foo1 ) [1] => Array ( [0] => foo2 ) [2] => Array ( [0] => bar1 ) [3] => Array ( [0] => bar2 ) )

preferences:
262.81 ms | 407 KiB | 449 Q