3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class Base {} class Sub extends Base{} class NoRelation {} abstract class I { public function foo(Sub $x) {} } class CorrectImplementor extends I { public function foo(Base $x) {} // Should be ok } class IncorrectImplementor extends I { public function foo(NoRelation $x) {} // Should be disallowed }
based on osXn2
Output for 7.0.0 - 7.2.0
Warning: Declaration of CorrectImplementor::foo(Base $x) should be compatible with I::foo(Sub $x) in /in/YVHRF on line 13 Warning: Declaration of IncorrectImplementor::foo(NoRelation $x) should be compatible with I::foo(Sub $x) in /in/YVHRF on line 17
Output for 5.5.0 - 5.6.28
Strict Standards: Declaration of CorrectImplementor::foo() should be compatible with I::foo(Sub $x) in /in/YVHRF on line 13 Strict Standards: Declaration of IncorrectImplementor::foo() should be compatible with I::foo(Sub $x) in /in/YVHRF on line 17