Eris\Generator\StringGeneratorTest::accumulateUsedChars PHP Method

    private function accumulateUsedChars(array $usedChars, $value)
    {
        for ($j = 0; $j < strlen($value); $j++) {
            $char = $value[$j];
            if (!isset($usedChars[$char])) {
                $usedChars[$char] = 0;
            }
            $usedChars[$char]++;
        }
        return $usedChars;
    }