3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function test($foo = null) {} } class Bar extends Foo { public function test($foo) {} }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Declaration of Bar::test($foo) must be compatible with Foo::test($foo = null) in /in/db8GY on line 7
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Declaration of Bar::test($foo) should be compatible with Foo::test($foo = NULL) in /in/db8GY on line 7
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Warning: Declaration of Bar::test($foo) should be compatible with Foo::test($foo = NULL) in /in/db8GY on line 8
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Strict Standards: Declaration of Bar::test() should be compatible with Foo::test($foo = NULL) in /in/db8GY on line 8
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206.07 ms | 402 KiB | 270 Q