3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function bar() { $a = function() { echo 'a'; }; $a(); } public function __invoke() { echo 'wtf'; } } var_dump((new Foo)->bar()); fb_intercept('Foo::__invoke', function () { echo '__invoke called!'; }); var_dump((new Foo)->bar());

preferences:
40.18 ms | 402 KiB | 5 Q