3v4l.org

run code in 300+ PHP versions simultaneously
<?php $i = 1000; $start = microtime(true); while ($i--) uniqid(""); $elapsed = microtime(true) - $start; printf("less_entropy: %.3f\n", $elapsed * 1000); $i = 1000; $start = microtime(true); while ($i--) uniqid("", true); $elapsed = microtime(true) - $start; printf("more_entropy: %.3f\n", $elapsed * 1000);

preferences:
32.05 ms | 402 KiB | 5 Q