PHP 保留小数点后几位

1-保留小数点后几位,不四舍五入

function formatNumber($number, $point = 2)
{
    if (false === ($pointPlace = strpos($number, '.'))){ 
        return number_format($number, 2, '.', '');
    } else {
        $tmpArr = explode('.', $number);
        return $tmpArr[0].'.'.substr($tmpArr[1],0,$point);
    }
}

2-保留小数点后的几位数

function saveThreePoint($number,$point = 3)
{
    $format='%.'.$point.'f';
    return isset($number) ? sprintf($format, $number) : 0.0000;
}