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run code in 150+ php & hhvm versions
Bugs & Features
<?php class A { public static function get() { static $instance = null; if ($instance === null) { $instance = new static(); } return $instance; } } final class B extends A { } final class C extends A { } var_dump(A::get()); var_dump(B::get()); var_dump(C::get());
based on ZsPi2
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(A)#1 (0) { } object(B)#2 (0) { } object(C)#3 (0) { }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/oeuq0 on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/oeuq0 on line 6
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/oeuq0 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_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/oeuq0 on line 3
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/oeuq0 on line 3
Process exited with code 255.