3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function bar(Bar $bar) { $bar->baz([$this, 'baz']); } protected function baz() { print 'Foobar!'.PHP_EOL; } } class Bar { public function baz(callable $baz) { $baz(); } } $foo = new Foo; $bar = new Bar; $foo->foo($bar);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 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
Fatal error: Uncaught Error: Call to undefined method Foo::foo() in /in/F5o4f:21 Stack trace: #0 {main} thrown in /in/F5o4f on line 21
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Fatal error: Call to undefined method Foo::foo() in /in/F5o4f on line 21
Process exited with code 255.
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