3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [["4|1","4|3","4|6"],[["4|1|2","4|1|8"],["4|3|4","4|3|9"],["4|6|5","4|6|12"]]]; array_walk_recursive($arr, function($v) use(&$result){ $result[] = $v; }); print_r($result);
Output for 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Array ( [0] => 4|1 [1] => 4|3 [2] => 4|6 [3] => 4|1|2 [4] => 4|1|8 [5] => 4|3|4 [6] => 4|3|9 [7] => 4|6|5 [8] => 4|6|12 )
preferences:
106.72 ms | 408 KiB | 5 Q