3v4l.org

run code in 300+ PHP versions simultaneously
<?php $tmp = 1; $a = new ArrayIterator(); $a[] = $tmp; echo serialize($a); ?>
Output for 7.4.6 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
O:13:"ArrayIterator":4:{i:0;i:0;i:1;a:1:{i:0;i:1;}i:2;a:0:{}i:3;N;}
Output for 7.4.0 - 7.4.5
O:13:"ArrayIterator":3:{i:0;i:0;i:1;a:1:{i:0;i:1;}i:2;a:0:{}}
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
C:13:"ArrayIterator":29:{x:i:0;a:1:{i:0;i:1;};m:a:0:{}}

preferences:
206.6 ms | 403 KiB | 332 Q