3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A {} class B extends A {} class C { function foo (B $a){} } class D extends C { function foo (A $a){} }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33
Warning: Declaration of D::foo(A $a) should be compatible with C::foo(B $a) in /in/gUJNo on line 15
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 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 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 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 - 4.3.11, 4.4.0 - 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.

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