3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class A {} class B extends A {} class C { function foo (B $a){} } class D extends C { function foo (A $a){} }
Output for 7.0.0 - 7.1.0
Warning: Declaration of D::foo(A $a) should be compatible with C::foo(B $a) in /in/gUJNo on line 15
Output for hhvm-3.10.0 - 3.12.0
Output for 5.4.0 - 5.6.28
Strict Standards: Declaration of D::foo() should be compatible with C::foo(B $a) in /in/gUJNo on line 15
Output for 5.0.0 - 5.3.29
Strict Standards: Declaration of D::foo() should be compatible with that of C::foo() in /in/gUJNo on line 15
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/gUJNo on line 9
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/gUJNo on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/gUJNo on line 9
Process exited with code 255.