3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class A { function f(Z $a) { } } class B extends A { function f(Y $a) { } } class Z { } class Y extends Z { }
Output for 7.0.0 - 7.1.0
Warning: Declaration of B::f(Y $a) should be compatible with A::f(Z $a) in /in/Y8j2Y on line 4
Output for 5.4.0 - 5.6.28
Strict Standards: Declaration of B::f() should be compatible with A::f(Z $a) in /in/Y8j2Y on line 4
Output for 5.0.0 - 5.3.29
Strict Standards: Declaration of B::f() should be compatible with that of A::f() in /in/Y8j2Y on line 4
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/Y8j2Y 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 ')' in /in/Y8j2Y on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/Y8j2Y on line 3
Process exited with code 255.