3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Test { public function callback() {} public function set(callable $callback) {} } $callback = ['Test', 'callback']; var_dump(is_callable($callback)); // return FALSE (new Test())->set($callback); // generate error ?>
Output for 8.0.0 - 8.0.22, 8.1.0 - 8.1.9
bool(false)
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30
bool(true)

preferences:
38.7 ms | 410 KiB | 5 Q