php bccomp的替换函数

if (!function_exists('bccomp')) {    /**     * 支持正数和负数的比较     * ++ -- +-     * @param $numOne     * @param $numTwo     * @param null $scale     * @return int|string     */    function bccomp($numOne, $numTwo, $scale = null)    {        //先判断是传过来的两个变量是否合法,不合法都返回'0'        if (!preg_match("/^([+-]?)d+(.d+)?$/", $numOne, $numOneSign) ||            !preg_match("/^([+-]?)d+(.d+)?$/", $numTwo, $numTwoSign)        ) {            return '0';        }        $sigNone = $numOneSign[1] === '-' ? '-' : '+';        $signTwo = $numTwoSign[1] === '-' ? '-' : '+';        if ($signOne !== $signTwo) {    //异号            if ($signOne === '-' && $signTwo === '+') {                return -1;            } else if ($signOne === '+' && $signTwo === '-') {                return 1;            } else {                return '0';            }        } else {  //同号            //两个负数比较            if ($signOne === "-" && $signTwo === '-') {                $numOne = abs($numOne);                $numTwo = abs($numTwo);                $flag = bccompPositiveNum($numOne, $numTwo, $scale);                if ($flag === 0) {                    return 0;                } else if ($flag === 1) {                    return -1;                } else if ($flag === -1) {                    return 1;                } else {                    return '0';                }            } else {    //两个正数比较                //两正数比较                return bccompPositiveNum($numOne, $numTwo, $scale);            }        }    }}if (!function_exists('bccompPositiveNum')) {    /**     * 比较正数的大小写问题     * @param $numOne     * @param $numTwo     * @param null $scale     * @return int|string     */    function bccompPositiveNum($numOne, $numTwo, $scale = null)    {        // check if they're valid positive numbers, extract the whole numbers and decimals        if (!preg_match("/^+?(d+)(.d+)?$/", $numOne, $tmpOne) ||            !preg_match("/^+?(d+)(.d+)?$/", $numTwo, $tmpTwo)        ) {            return '0';        }        // remove leading zeroes from whole numbers        $numOne = ltrim($tmpOne[1], '0');        $numTwo = ltrim($tmpTwo[1], '0');        // first, we can just check the lengths of the numbers, this can help save processing time        // if $numOne is longer than $numTwo, return 1.. vice versa with the next step.        if (strlen($numOne) > strlen($numTwo)) {            return 1;        } else {            if (strlen($numOne) < strlen($numTwo)) {                return -1;            } // if the two numbers are of equal length, we check digit-by-digit            else {                // remove ending zeroes from decimals and remove point                $Dec1 = isset($tmpOne[2]) ? rtrim(substr($tmpOne[2], 1), '0') : '';                $Dec2 = isset($tmpTwo[2]) ? rtrim(substr($tmpTwo[2], 1), '0') : '';                // if the user defined $scale, then make sure we use that only                if ($scale != null) {                    $Dec1 = substr($Dec1, 0, $scale);                    $Dec2 = substr($Dec2, 0, $scale);                }                // calculate the longest length of decimals                $DLen = max(strlen($Dec1), strlen($Dec2));                // append the padded decimals onto the end of the whole numbers                $numOne .= str_pad($Dec1, $DLen, '0');                $numTwo .= str_pad($Dec2, $DLen, '0');                // check digit-by-digit, if they have a difference, return 1 or -1 (greater/lower than)                for ($i = 0; $i < strlen($numOne); ++$i) {                    if ((int)$numOne{$i} > (int)$numTwo{$i}) {                        return 1;                    } elseif ((int)$numOne{$i} < (int)$numTwo{$i}) {                        return -1;                    }                }                // if the two numbers have no difference (they're the same).. return 0                return 0;            }        }    }}