PHP 类中的 simplexml_load_file() 问题答案

【问题标题】：simplexml_load_file() issues within PHP classPHP 类中的 simplexml_load_file() 问题
【发布时间】：2012-02-14 15:17:38
【问题描述】：

所以我正在尝试使用我发现的一个类来解决我遇到的电子商务问题。

Original Blog Post

在华盛顿州的在线商店需要根据送货地址确定税率。

WA Sales Tax Rate Lookup URL Interface

类：

/**
 * @author SmallDog
 * @contact dustin@smalldo.gs
 * @created 01-27-2011 
**/

class destinationTax
{
    private $dor_url = 'http://dor.wa.gov';

    function __construct(){ }

    function getTax($addr,$city,$zip)
    {
        $req = $this->dor_url."/AddressRates.aspx?output=xml&addr=$addr&city=$city&zip=$zip";
        return $this->_get_decoded($req);
    }

    private function _get_decoded($url)
    {
        $url = urlencode($url);
        if($xml = simplexml_load_file($url))
        {
            switch($xml->attributes()->code)
            {
                case 0:
                    // Code 0 means address was perfect
                    break;
                case 1:
                    $xml->msg = "Warning: The address was not found, but the ZIP+4 was located.";
                    break;
                case 2:
                    $xml->msg = "Warning: Neither the address or ZIP+4 was found, but  the 5-digit ZIP was located.";
                    break;
                case 3:
                    $xml->msg = "Error: The address, ZIP+4, and ZIP could not be found.";
                    break;
                case 4:
                    $xml->msg = "Error: Invalid arguements.";
                    break;
                case 5:
                    $xml->msg = "Error: Internal error.";
            }
        }
        else $xml = "Error: Could not load XML.";

        return  $xml;
    }
}

用途：

$tax = new destinationTax;
$tax = $tax->getTax("123 Main Street", "Kirkland", "98033");
echo $tax->attributes()->rate;

错误：

警告：simplexml_load_file() [function.simplexml-load-file]: URL 文件访问在服务器配置中被禁用 /.../.../classes.php

警告： simplexml_load_file(http://dor.wa.gov/AddressRates.aspx?output=xml&addr=123+Main+Street&city=Kirkland&zip=98033) [function.simplexml-load-file]：无法打开流：没有合适的包装器可以在 /.../.../classes.php 中找到

警告：simplexml_load_file() [function.simplexml-load-file]：I/O 警告：无法加载外部实体 “http%3A%2F%2Fdor.wa.gov%2FAddressRates.aspx%3Foutput%3Dxml%26addr%3D123+Main+Street%26city%3DKirkland%26zip%3D98033” 在 /.../.../classes.php

致命错误：在非对象上调用成员函数 attributes() /.../.../tax.php

【问题讨论】：

URL file-access is disabled in the server configuration 是比较明确的......请参阅php.net/manual/en/function.fopen.php 以获得解释

标签： php simplexml

【解决方案1】：

您的服务器不支持远程文件访问。如果您有 cURL 访问权限，则可以通过这种方式获取 XML 数据，如下例所示：

$curl = curl_init($url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
$data = curl_exec($curl);

$xml = simplexml_load_string($data);

// ...

【讨论】：