3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr=array(); $c=''; for ($i=0;$i<=9999;$i++) { $arr[]=uniqid('',true); } $max=count($arr); for ($i=0;$i<$max;$i++) { $c.=$arr[$i]; } echo strlen($c); ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.25, 7.3.0 - 7.3.12, 7.4.0
230000
preferences:
247.18 ms | 404 KiB | 317 Q