Count the number of digits of a number

count_digits.php

#!/usr/bin/env php
<?php

function count_digits($number, $base = 10) {
    return get_n(
        $base,
        intval(is_string($number) ? strval($number) : $number, $base)
    );
}

function get_n($base, $number, $n = 1) {
    return $number < pow($base, $n) ?
        $n
        : get_n($base, $number, $n + 1);
}

var_dump(count_digits(0xFFF, 16));