3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class A { } class B extends A { } class C { public function f(B $x) { } } class D extends C { public function f(A $x) { } }
Output for 7.0.0 - 7.1.0
Warning: Declaration of D::f(A $x) should be compatible with C::f(B $x) in /in/UWYf3 on line 12
Output for hhvm-3.12.0
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.6.28
Strict Standards: Declaration of D::f() should be compatible with C::f(B $x) in /in/UWYf3 on line 12
Output for 5.0.0 - 5.3.29
Strict Standards: Declaration of D::f() should be compatible with that of C::f() in /in/UWYf3 on line 12
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/UWYf3 on line 7
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/UWYf3 on line 7
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/UWYf3 on line 7
Process exited with code 255.