/*     * number_price(准备要开始的价格,要保留的小数位数,小数点显示的符号,千分位分隔符)     * php4,php5     * 默认将进行四舍五入处理    */    //牛刀小试,深入其意    $old_price = ‘123456.345‘;    $new_price01 = number_format($old_price,2,‘.‘,‘,‘);    var_dump($new_price01);//123,456.35    $new_price02 = number_format($old_price,2,‘.‘,‘‘);    var_dump($new_price02);//123456.35       $old_price02 = ‘123456.344‘;    $new_price03 = number_format($old_price02,2,‘.‘,‘‘);    var_dump($new_price03);//123456.34    //直接舍弃,不采用四舍五入取之    $new_price04 = substr(number_format($old_price,3,‘.‘,‘‘),0,-1);    var_dump($new_price04);//123456.34    //直接取整    $old_price03 = ‘666.66‘;    $new_price05 = intval($old_price03);    var_dump($new_price05);//666    //四舍五入后去整    $new_price06 = number_format($old_price03,0,‘‘,‘‘);    var_dump($new_price06);//667

/*** 格式化商品价格** @access public* @param float $price 商品价格* @return string*/function price_format($price, $change_price = true){    if($price===‘‘)    {     $price=0;    }    if ($change_price)    {        switch ($change_price)        {            case 0:                $price = number_format($price, 2, ‘.‘, ‘‘);                break;            case 1: // 保留不为 0 的尾数                $price = preg_replace(‘/(.*)(\\.)([0-9]*?)0+$/‘, ‘\1\2\3‘, number_format($price, 2, ‘.‘, ‘‘));                if (substr($price, -1) == ‘.‘)                {                    $price = substr($price, 0, -1);                }                break;            case 2: // 不四舍五入，保留1位                $price = substr(number_format($price, 2, ‘.‘, ‘‘), 0, -1);                break;            case 3: // 直接取整                $price = intval($price);                break;            case 4: // 四舍五入，保留 1 位                $price = number_format($price, 1, ‘.‘, ‘‘);                break;            case 5: // 先四舍五入，不保留小数                // $price = round($price);                //取两位小数，                $price = number_format($price, 2, ‘.‘, ‘‘);                break;        }    }      else    {        $price = number_format($price, 2, ‘.‘, ‘‘);    }    //return sprintf($GLOBALS[‘_CFG‘][‘currency_format‘], $price);    return $price;}