3v4l.org

run code in 300+ PHP versions simultaneously
<?php $d = new \stdClass(); $d->foo = 'bar'; $d->a = array(array($d, 'blah')); print serialize($d);
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
O:8:"stdClass":2:{s:3:"foo";s:3:"bar";s:1:"a";a:1:{i:0;a:2:{i:0;r:1;i:1;s:4:"blah";}}}
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/S0onn on line 4 O:8:"stdClass":2:{s:3:"foo";s:3:"bar";s:1:"a";a:1:{i:0;a:2:{i:0;r:1;i:1;s:4:"blah";}}}
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/S0onn on line 4 O:8:"stdClass":2:{s:3:"foo";s:3:"bar";s:1:"a";a:1:{i:0;a:2:{i:0;O:8:"stdClass":1:{s:3:"foo";s:3:"bar";}i:1;s:4:"blah";}}}

preferences:
235.13 ms | 402 KiB | 328 Q