PHP不四舍五入|只舍|只入|四舍五入

//保留两位小数
        $power = pow(10,2);
        $num = 1666.667788;
        $num1 = 1666.61188;
        //全入
        $yes_num = ceil($num*$power)/$power; //1666.67
        $yes_num = ceil($num1*$power)/$power; //1666.62
        //全舍弃
        $no_num = floor($num*$power)/$power; //1666.66
        $no_num = floor($num1*$power)/$power; //1666.61
        //四舍五入
        $new_num = number_format($num,2); //1,666.67
        $new_num = number_format($num1,2); //1,666.61