php计算两个数字的比例

  // 比例计算
    function ratio($a, $b) {
        $_a = $a;
        $_b = $b;
        while ($_b != 0) {
            $remainder = $_a % $_b;
            $_a = $_b;
            $_b = $remainder;
        }
        $gcd = abs($_a);
        return ($a / $gcd)  . ':' . ($b / $gcd);

    }