3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x=array(); for ($i=0;$i++;$i<100) { $x[$i] = array(); for ($j=0;$j++;$j<1000) { $x[$i][$j] = mt_rand(); } } $y = (array) $x; echo sizeof($y);

preferences:
36.51 ms | 402 KiB | 5 Q