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if(!function_exists('substrFloatNums')) {
    /**
     * ½ØÈ¡NλСÊý,ÉáÈ¥ºóÃæµÄλÊý
     * @author lulijuan
     * @param $number ´«ÈëµÄÊýÖµ
     * @param $length ±£ÁôµÄСÊýλÊý
     * @return float ·µ»ØÖµ
     */
    function substrFloatNums($number, $length=2)
    {
        //2λµÄʱºò
        if(2==$length) {
            return sprintf("%.2f",substr(sprintf("%.3f", $number), 0, -1));
        }
        //ÆäËüλÊý
        $number = (float)$number;
        $intStr = strstr($number, '.', True);
        $floatStr = substr(strstr($number, '.'),0,$length+1);
        $floatNumber = $intStr.$floatStr;
        return  (float)$floatNumber;
    }
}