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run code in 150+ php & hhvm versions
Bugs & Features
<?php class A { public $e = array(); } $c = new A; for ($i = 0; $i < 4; $i++) { $e = new A; $c->e[] = $e; $e->e = $c->e; } unserialize(serialize($c)); class Token implements \Serializable { public function serialize() { global $c; return serialize(array(serialize($c))); } public function unserialize($str) { $r = unserialize($str); $r = unserialize($r[0]); } } $token = new Token; $token = serialize($token); unserialize($token);
Output for 5.3.0 - 5.3.29, 5.4.20 - 5.4.45, 5.5.4 - 7.1.0
Output for 5.4.0 - 5.4.19, 5.5.0 - 5.5.3

Process exited with code 139.
Output for 5.1.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/YfKjS on line 18
Output for 5.0.5
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/YfKjS on line 18 Fatal error: Interface 'Serializable' not found in /in/YfKjS on line 18
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/YfKjS on line 18 Fatal error: Class 'Serializable' not found in /in/YfKjS on line 18
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/YfKjS on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/YfKjS on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/YfKjS on line 4
Process exited with code 255.