3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $items=array(); for ($j=1;$j<=2;$j++) { for ($i=0;$i<4*$j;$i++) { $item=&$items[$i]; if (!isset($item)) $item=$j."_".$i; $item=$item.="x"; } } print_r($items); foreach ($items as $item) echo $item."\n"; print_r($items);
Output for 4.3.0 - 7.1.0
Array ( [0] => 1_0xx [1] => 1_1xx [2] => 1_2xx [3] => 1_3xx [4] => 2_4x [5] => 2_5x [6] => 2_6x [7] => 2_7x ) 1_0xx 1_1xx 1_2xx 1_3xx 2_4x 2_5x 2_6x 2_6x Array ( [0] => 1_0xx [1] => 1_1xx [2] => 1_2xx [3] => 1_3xx [4] => 2_4x [5] => 2_5x [6] => 2_6x [7] => 2_6x )