3v4l.org

run code in 300+ PHP versions simultaneously
<?php class c1 { private $callback; public function setFun($callback) { $this->callback = $callback; } public function fun() { ($this->callback)(); } } $n = new c1(); $n->setFun(function () { var_dump('this callback'); }); $n->fun();
Output for 7.4.0 - 7.4.33, 8.0.1 - 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
string(13) "this callback"

preferences:
108.29 ms | 406 KiB | 5 Q