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run code in 150+ php & hhvm versions
Bugs & Features
<?php error_reporting(-1); interface Supertype {} class Superclass implements Supertype { public function fn(Superclass $x) {} } class Subclass extends Superclass { public function fn(Supertype $x) {} } new Subclass;
Output for 7.0.0 - 7.1.0
Warning: Declaration of Subclass::fn(Supertype $x) should be compatible with Superclass::fn(Superclass $x) in /in/8t23V on line 11
Output for hhvm-3.10.0 - 3.12.0
Output for 5.4.0 - 5.6.28
Strict Standards: Declaration of Subclass::fn() should be compatible with Superclass::fn(Superclass $x) in /in/8t23V on line 12
Output for 5.3.0 - 5.3.29
Strict Standards: Declaration of Subclass::fn() should be compatible with that of Superclass::fn() in /in/8t23V on line 12
Output for 5.0.0 - 5.2.17
Strict Standards: Declaration of Subclass::fn() should be compatible with that of Superclass::fn() in /in/8t23V on line 11
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/8t23V 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 in /in/8t23V on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/8t23V on line 4
Process exited with code 255.