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run code in 150+ php & hhvm versions
Bugs & Features
<?php class obj implements Serializable { public function serialize() { return 123; } public function unserialize($data) { } } $obj = new obj; $ser = serialize($obj);
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Exception: obj::serialize() must return a string or NULL in /in/DebH8:11 Stack trace: #0 /in/DebH8(11): serialize(Object(obj)) #1 {main} thrown in /in/DebH8 on line 11
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: obj::serialize() must return a string or NULL in /in/DebH8 on line 11
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.6.28
Fatal error: Uncaught exception 'Exception' with message 'obj::serialize() must return a string or NULL' in /in/DebH8:11 Stack trace: #0 /in/DebH8(11): serialize(Object(obj)) #1 {main} thrown in /in/DebH8 on line 11
Process exited with code 255.
Output for 5.0.5
Fatal error: Interface 'Serializable' not found in /in/DebH8 on line 2
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Fatal error: Class 'Serializable' not found in /in/DebH8 on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/DebH8 on line 2
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 '{' in /in/DebH8 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/DebH8 on line 2
Process exited with code 255.