php 使用 SimpleXML 遍历 XML 对象
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Loop through an XML object with SimpleXML
提问by Zabs
I am trying to use SimpleXML in PHP to loop through a XML object - the object format is below:-
我正在尝试在 PHP 中使用 SimpleXML 来遍历 XML 对象 - 对象格式如下：-
I get the following error when I try to get the element tags by name - can anyone explain what I am doing wrong?
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 ...
Below is the XML file I am reading from:
下面是我正在阅读的 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>
My PHP code is below:
我的PHP代码如下：
$devices = $xml->getElementsByTagName( "response" ); // error on this line
I am trying to make devices an array so I can use the data in a foreach loop.
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。
回答by MrCode
SimpleXML doesn't have a getElementsByTagName()method (DOMDocument does).
SimpleXML 没有getElementsByTagName()方法（DOMDocument 有）。
In SimpleXML, the object (e.g $xml) is treated as the root element. So you can loop through the product items like so:
在 SimpleXML 中，对象（例如$xml）被视为根元素。所以你可以像这样循环遍历产品项目：
$xml = simplexml_load_string($xmlString);
foreach($xml->products->item as $item)
{
echo (string)$item->product_id;
echo (string)$item->model;
}
Example of building a devices associative array:
构建设备关联数组的示例：
$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);
Outputs:
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
)
)
回答by hakre
I don't want to spoil the existing answeras it is answering correct an in a general fashion.
我不想破坏现有答案，因为它以一般方式回答正确。
For your concreterequirements as with your XML there aren't any attributes and you're just looking for the element-name => node-valuepairs here, there is one function that comes to mind in conjunction with SimpleXMLElement here: get_object_vars.
为了您的具体要求与XML没有任何属性，而你只是为了寻找元素名称=>节点-值对在这里，有自带与的SimpleXMLElement结合想到这里一个功能：get_object_vars。
It is useful whenever you convert an object into an array and as SimpleXMLElement turns element names into object property names and the node-values as those property values it's pretty straight forward here:
每当您将对象转换为数组并且 SimpleXMLElement 将元素名称转换为对象属性名称和节点值作为这些属性值时，它非常有用，这里非常简单：
$xml = simplexml_load_string($buffer);
$items = $xml->products->item;
$devices = array_map('get_object_vars', iterator_to_array($items, FALSE));
print_r($devices);
The output is as suggested in the existing answer. And the online demo is here: https://eval.in/57109.
输出与现有答案中的建议相同。在线演示在这里：https: //eval.in/57109。
You will likely able to achieve similar results with casting to arrays (if not exactly the same with SimpleXML), however in this case as I wanted to map it, I needed a true function.
您可能能够通过转换为数组获得类似的结果（如果与 SimpleXML 不完全相同），但是在这种情况下，因为我想映射它，我需要一个真正的函数。
There is also the json-en- and -de-code doubling for converting complete trees, which comes in handy here, too:
还有用于转换完整树的 json-en- 和 -de-code 加倍，这在这里也派上用场：
$xml = simplexml_load_string($buffer);
$items = $xml->products;
$devices = json_decode(json_encode($items), TRUE)['item'];
The output then again is exactly as the existing answer. And the online demo again is here: https://eval.in/57117
然后输出与现有答案完全相同。在线演示再次在这里：https: //eval.in/57117
Hope this is helpful and widens the view a bit.
希望这会有所帮助，并稍微拓宽视野。
