3v4l.org

run code in 300+ PHP versions simultaneously
<?php function function_name(){} class C{ static function m(){} } $f = function(){}; var_dump(is_callable('function_name')); var_dump(is_callable(function(){})); var_dump(is_callable(array('C','m'))); var_dump(is_callable(array(new C(),'m'))); var_dump(is_callable($f));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.24, 8.3.0 - 8.3.12
bool(true) bool(true) bool(true) bool(true) bool(true)
preferences:
60.44 ms | 406 KiB | 5 Q