3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [5, 1 , 2, 3, [1,5,59,47,58,[0,12,562]]]; array_walk_recursive($arr, function($v) use (&$res){$res[]=$v;}); echo min($res);

preferences:
27.33 ms | 405 KiB | 5 Q