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run code in 300+ PHP versions simultaneously
<?php for($x = 0; $x< 30; $x++){ unset($aDate); exec("date", $aDate); print("date(\"d.m.y H:i:s\") yields: ".date("d.m.y H:i:s")." while 'date' yields $aDate[0].\n"); sleep(1); }

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38.33 ms | 402 KiB | 5 Q