3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $instance = new stdClass; $instance->f = $instance; var_dump(serialize([1, 2, 3, 5 => $instance, [$instance, $instance]]));
based on 7RinM
Output for 5.4.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(91) "a:5:{i:0;i:1;i:1;i:2;i:2;i:3;i:5;O:8:"stdClass":1:{s:1:"f";r:5;}i:6;a:2:{i:0;r:5;i:1;r:5;}}"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/rYASa on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/rYASa on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/rYASa on line 6
Process exited with code 255.