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run code in 300+ PHP versions simultaneously
<?php function calc($n, &$a) { $b = 18; while($n) { $a = $b * $b * $b * $b; $n--; } } $n = 5000000; $a = 0; $start = microtime(true); calc($n, $a); $end = microtime(true); echo "$a\n"; printf("%.6f seconds\n", $end - $start);

preferences:
33.45 ms | 402 KiB | 5 Q