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run code in 300+ PHP versions simultaneously
<?php final class DemoFile { public function run() { $test = 'Super'; $this->myCallback( function () use ($test) { return compact('test'); } ); } private function myCallback($callback) { var_dump($callback()); } } $d = new DemoFile(); $d->run();

preferences:
29.93 ms | 405 KiB | 5 Q