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run code in 150+ php & hhvm versions
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<?php function count_digits($digit) { // TODO: add type validation return $digit >= 10 ? 1 + count_digits($digit / 10) : 1; } $digit = 15; var_dump(count_digits($digit));
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(2)