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run code in 300+ PHP versions simultaneously
<?php for($i = 0; $i < 1000; $i++) { list($s1, $s2) = explode(' ', microtime()); date('YmdHis').(float)sprintf('%.0f', (floatval($s1) + floatval($s2)) * 1000); }

preferences:
36.59 ms | 402 KiB | 5 Q