php - 使用 SimpleXML 遍历 XML 对象

Question

我正在尝试在 PHP 中使用 SimpleXML 循环遍历 XML 对象 - 对象格式如下:-

当我尝试按名称获取元素标签时出现以下错误 - 谁能解释我做错了什么？

Call to undefined method SimpleXMLElement::getElementsByTagName() on ...

下面是我正在读取的 XML 文件:

<?xml version="1.0" encoding="utf-8"?>
<response>
    <products>
        <item>
            <product_id>32417</product_id>
            <manufacturer>Alcatel</manufacturer>
            <model>Sparq 2</model>
            <deeplink>http://www.mysite.com/sc_offer?gid=32417</deeplink>
            <thumbnail_URL>http://www.mysite.com/images/devices/thumbs/Alcatel-Sparq-II.jpg</thumbnail_URL>
            <image_URL>http://www.mysite.com/images/devices/Alcatel-Sparq-II.jpg</image_URL>
            <price_not_working>0.00</price_not_working>
            <price_poor>0.00</price_poor>
            <price_fair>20.00</price_fair>
            <price_good>25.00</price_good>
            <price_perfect>25.00</price_perfect>
            <price_new>25.00</price_new>
            <battery_new>1.00</battery_new>
            <battery_perfect>1.00</battery_perfect>
            <battery_good>1.00</battery_good>
            <battery_fair>1.00</battery_fair>
            <battery_poor>0.00</battery_poor>
            <charger_new>1.00</charger_new>
            <charger_perfect>1.00</charger_perfect>
            <charger_good>1.00</charger_good>
            <charger_fair>1.00</charger_fair>
            <charger_poor>0.00</charger_poor>
            <packaging_new>1.00</packaging_new>
            <packaging_perfect>1.00</packaging_perfect>
            <packaging_good>1.00</packaging_good>
            <packaging_fair>1.00</packaging_fair>
            <packaging_poor>0.00</packaging_poor>
        </item>
        <item>
            <product_id>31303</product_id>
            <manufacturer>Apple</manufacturer>
            <model>iPhone 3G 8gb</model>
            <deeplink>http://www.mysite.com/sc_offer?gid=31303</deeplink>
            <thumbnail_URL>http://www.mysite.com/images/devices/thumbs/iPhone 8 3G.jpg</thumbnail_URL>
            <image_URL>http://www.mysite.com/images/devices/iPhone 8 3G.jpg</image_URL>
            <price_not_working>0.00</price_not_working>
            <price_poor>0.00</price_poor>
            <price_fair>7.00</price_fair>
            <price_good>2.00</price_good>
            <price_perfect>2.00</price_perfect>
            <price_new>2.00</price_new>
            <battery_new>1.00</battery_new>
            <battery_perfect>1.00</battery_perfect>
            <battery_good>1.00</battery_good>
            <battery_fair>1.00</battery_fair>
            <battery_poor>0.00</battery_poor>
            <charger_new>1.00</charger_new>
            <charger_perfect>1.00</charger_perfect>
            <charger_good>1.00</charger_good>
            <charger_fair>1.00</charger_fair>
            <charger_poor>0.00</charger_poor>
            <packaging_new>1.00</packaging_new>
            <packaging_perfect>1.00</packaging_perfect>
            <packaging_good>1.00</packaging_good>
            <packaging_fair>1.00</packaging_fair>
            <packaging_poor>0.00</packaging_poor>
        </item>
    </products>
</response>

我的 PHP 代码如下:

$devices = $xml->getElementsByTagName( "response" ); // error on this line

我正在尝试使设备成为一个数组，以便我可以在 foreach 循环中使用数据。

Answer 1

SimpleXML 没有 getElementsByTagName() 方法(DOMDocument 有)。

在 SimpleXML 中，对象(例如 $xml)被视为根元素。因此，您可以像这样遍历产品项:

$xml = simplexml_load_string($xmlString);
foreach($xml->products->item as $item)
{
    echo (string)$item->product_id;
    echo (string)$item->model;
}

构 build 备关联数组的示例:

$devices = array();

$xml = simplexml_load_string($xmlString);
foreach($xml->products->item as $item)
{
   $device = array();

   foreach($item as $key => $value)
   {
        $device[(string)$key] = (string)$value;
   }

   $devices[] = $device;
}

print_r($devices);

输出:

Array
(
    [0] => Array
        (
            [product_id] => 32417
            [manufacturer] => Alcatel
            [model] => Sparq 2
            [deeplink] => http://www.mysite.com/sc_offer?gid=32417
            [thumbnail_URL] => http://www.mysite.com/images/devices/thumbs/Alcatel-Sparq-II.jpg
            [image_URL] => http://www.mysite.com/images/devices/Alcatel-Sparq-II.jpg
            [price_not_working] => 0.00
            [price_poor] => 0.00
            [price_fair] => 20.00
            [price_good] => 25.00
            [price_perfect] => 25.00
            [price_new] => 25.00
            [battery_new] => 1.00
            [battery_perfect] => 1.00
            [battery_good] => 1.00
            [battery_fair] => 1.00
            [battery_poor] => 0.00
            [charger_new] => 1.00
            [charger_perfect] => 1.00
            [charger_good] => 1.00
            [charger_fair] => 1.00
            [charger_poor] => 0.00
            [packaging_new] => 1.00
            [packaging_perfect] => 1.00
            [packaging_good] => 1.00
            [packaging_fair] => 1.00
            [packaging_poor] => 0.00
        )

    [1] => Array
        (
            [product_id] => 31303
            [manufacturer] => Apple
            [model] => iPhone 3G 8gb
            [deeplink] => http://www.mysite.com/sc_offer?gid=31303
            [thumbnail_URL] => http://www.mysite.com/images/devices/thumbs/iPhone 8 3G.jpg
            [image_URL] => http://www.mysite.com/images/devices/iPhone 8 3G.jpg
            [price_not_working] => 0.00
            [price_poor] => 0.00
            [price_fair] => 7.00
            [price_good] => 2.00
            [price_perfect] => 2.00
            [price_new] => 2.00
            [battery_new] => 1.00
            [battery_perfect] => 1.00
            [battery_good] => 1.00
            [battery_fair] => 1.00
            [battery_poor] => 0.00
            [charger_new] => 1.00
            [charger_perfect] => 1.00
            [charger_good] => 1.00
            [charger_fair] => 1.00
            [charger_poor] => 0.00
            [packaging_new] => 1.00
            [packaging_perfect] => 1.00
            [packaging_good] => 1.00
            [packaging_fair] => 1.00
            [packaging_poor] => 0.00
        )

)