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run code in 300+ PHP versions simultaneously
<?php $callbacks = array(); // Setup with lots of callbacks for ($i = 0; $i < 25000; $i++) { $callbacks[] = function () use ($i) { return $i; }; } foreach (array_reverse($callbacks) as $callback) { echo $callback() .PHP_EOL; }

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51.46 ms | 402 KiB | 5 Q