3v4l.org

run code in 300+ PHP versions simultaneously
<?php $user = ['admin', (string)time()]; $a=&$user; echo serialize($a);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.2, 5.6.4 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.13, 7.3.0 - 7.3.1
a:2:{i:0;s:5:"admin";i:1;s:10:"1445098931";}
Output for 5.6.3
a:2:{i:0;s:5:"admin";i:1;s:10:"1445098930";}
preferences:
149.84 ms | 401 KiB | 205 Q