3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A {} class B extends A {} class Foo { public function bar(B $b) {} } class Woo extends Foo { public function bar(A $b) {} } $w = new Woo();
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Warning: Declaration of Woo::bar(A $b) should be compatible with Foo::bar(B $b) in /in/I3v0u on line 13
Output for 5.6.0 - 5.6.40
Strict Standards: Declaration of Woo::bar() should be compatible with Foo::bar(B $b) in /in/I3v0u on line 13
preferences:
147.59 ms | 408 KiB | 5 Q