3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function shout(string $what, $arg = null) {} } class Bar extends Foo { public function shout(string $what) { } } new Bar;
Output for 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
Fatal error: Declaration of Bar::shout(string $what) must be compatible with Foo::shout(string $what, $arg = null) in /in/uJYG1 on line 8
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Declaration of Bar::shout(string $what) should be compatible with Foo::shout(string $what, $arg = NULL) in /in/uJYG1 on line 8
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Warning: Declaration of Bar::shout(string $what) should be compatible with Foo::shout(string $what, $arg = NULL) in /in/uJYG1 on line 10
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