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<?php function count_digits($digit) { // TODO: add type validation return $digit >= 10 ? 1 + count_digits($digit / 10) : 1; } $digit = 1554; $tries = 10000; $start = microtime(true); for ($i = 0; $i < $tries; $i++) { count_digits($digit); } echo (microtime(true) - $start); $start = microtime(true); for ($i = 0; $i < $tries; $i++) { strlen($digit); } echo (microtime(true) - $start);

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32.42 ms | 402 KiB | 5 Q