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run code in 300+ PHP versions simultaneously
<?php for ($closure = function($a, $b) { return $a * $b; }, $a = 0, $b = 0, $i = 10; $closure($a, $b) < $i; $i++, $a++, $b++) {} var_dump($a, $b, $i);

preferences:
132.15 ms | 404 KiB | 5 Q