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run code in 150+ php & hhvm versions
Bugs & Features
<?php abstract class A { private $x; final public function __sleep() { return array_keys(get_object_vars($this)); } } class B extends A {} var_dump(serialize(new B));
Output for 5.2.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: serialize(): "x" returned as member variable from __sleep() but does not exist in /in/mTZpa on line 12 string(22) "O:1:"B":1:{s:1:"x";N;}"
Output for 5.0.0 - 5.0.4, 5.1.0 - 5.2.3
string(12) "O:1:"B":0:{}"
Output for 5.0.5

Process exited with code 139.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/mTZpa on line 3
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_CLASS in /in/mTZpa on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/mTZpa on line 3
Process exited with code 255.