3v4l.org

run code in 300+ PHP versions simultaneously
<?php spl_autoload_register(function ($class) { echo $class . "\n"; if (0 === strpos(ltrim($class, '/'), 'Symfony\Component\EventDispatcher')) { if (file_exists($file = __DIR__.'/../'.substr(str_replace('\\', '/', $class), strlen('Symfony\Component\EventDispatcher')).'.php')) { require_once $file; } } }); new Symfony\Component\EventDispatcher\doesntexist;

preferences:
42.32 ms | 402 KiB | 5 Q