3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a=array('a0','a1','a2','a3','a4','a5'); $b=array('b0','b1','b2','b3','b4','b5'); $flip = TRUE; $merged = array_map(function($v1, $v2)use(&$flip){ if($flip = !$flip ? TRUE : FALSE) return [$v2[0], $v1[0], $v2[1], $v1[1]]; return [$v1[0], $v2[0], $v1[1], $v2[1]]; }, array_chunk($a, 2), array_chunk($b, 2)); print_r($merged);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 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] => a0 [1] => b0 [2] => a1 [3] => b1 ) [1] => Array ( [0] => b2 [1] => a2 [2] => b3 [3] => a3 ) [2] => Array ( [0] => a4 [1] => b4 [2] => a5 [3] => b5 ) )
preferences:
266.03 ms | 405 KiB | 332 Q