3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = new \StdClass; $bar = new \StdClass; $foo->bar = $bar; $bar->foo = $foo; $vars = array('foo' => $foo, 'bar' => $bar); var_dump(serialize($vars));
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 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, 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
string(92) "a:2:{s:3:"foo";O:8:"stdClass":1:{s:3:"bar";O:8:"stdClass":1:{s:3:"foo";r:2;}}s:3:"bar";r:3;}"
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/Rp4VQ on line 2 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rp4VQ on line 3 string(92) "a:2:{s:3:"foo";O:8:"stdClass":1:{s:3:"bar";O:8:"stdClass":1:{s:3:"foo";r:2;}}s:3:"bar";r:3;}"
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rp4VQ on line 2 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rp4VQ on line 3 string(107) "a:2:{s:3:"foo";O:8:"stdClass":1:{s:3:"bar";O:8:"stdClass":0:{}}s:3:"bar";O:8:"stdClass":1:{s:3:"foo";r:2;}}"
Output for 4.3.0 - 4.3.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rp4VQ on line 2 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rp4VQ on line 3 string(151) "a:2:{s:3:"foo";O:8:"stdClass":1:{s:3:"bar";O:8:"stdClass":0:{}}s:3:"bar";O:8:"stdClass":1:{s:3:"foo";O:8:"stdClass":1:{s:3:"bar";O:8:"stdClass":0:{}}}}"
preferences:
299.88 ms | 402 KiB | 460 Q