PHP的SimpleXML：如何在名字中使用冒号

我正在使用Simple XML 生成 RSS Google Merchant.

Google提供的示例是：

<?xml version="1.0"?>
<RSS version="2.0" 
xmlns:g="http://base.google.com/ns/1.0">
<channel>
<title>The name of your data Feed</title>
<link>http://www.example.com</link>
<description>A description of your content</description>
<item>
<title>Red wool sweater</title>
<link> http://www.example.com/item1-info-page.html</link>
<description>Comfortable and soft,this sweater will keep you warm on those cold winter nights.</description>
<g:image_link>http://www.example.com/image1.jpg</g:image_link> <g:price>25</g:price> <g:condition>new</g:condition> <g:id>1a</g:id>
</item>
</channel>
</RSS>

我的代码有：

$product->addChild("g:condition",'new');

哪个产生：

<condition>new</condition>

我在线阅读我应该改用：

$product->addChild("g:condition",'new','http://base.google.com/ns/1.0');

现在生成的

<g:condition xmlns:g="http://base.google.com/ns/1.0">new</g:condition>

这似乎对我来说是非常反直觉的,因为现在的“xmlns”声明几乎是我的RSS Feed中几乎每一行在根元素中的一次.

我错过了什么吗？

@ceejayoz表示,您需要将“http://base.google.com/ns/1.0”命名空间添加到根节点,以便SimpleXML知道命名空间已经被声明,并且不会发出重复的前缀绑定.

我想你可能需要阅读tutorial on XML Namespaces,因为我不确定你真的明白“g：”在这里做什么.

这是一个更完整的例子.
XML：

$xml = <<<EOT 
<?xml version="1.0"?> 
<RSS version="2.0" xmlns:g="http://base.google.com/ns/1.0"> 
  <channel> 
    <title>The name of your data Feed</title> 
    <link>http://www.example.com</link> 
    <description>A description of your content</description> 
    <item> 
      <title>Red wool sweater</title> 
      <link> http://www.example.com/item1-info-page.html</link> 
      <description>Comfortable and soft,this sweater will keep you warm on those cold winter nights.</description> 
      <g:image_link>http://www.example.com/image1.jpg</g:image_link> 
      <g:price>25</g:price> 
      <g:id>1a</g:id> 
    </item> 
  </channel> 
</RSS> 
EOT 
;

码：

$RSS = new SimpleXMLElement($xml); 
$NS = array( 
    'g' => 'http://base.google.com/ns/1.0' 
); 
$RSS->registerXPathNamespace('g',$NS['g']); 
$product = $RSS->channel->item[0]; // example 

// Use the complete namespace. 
// Don't add "g" prefix to element name--what prefix will be used is 
// something SimpleXML takes care of. 
$product->addChild('condition',$NS['g']); 

echo $RSS->asXML();

我通常使用这种模式轻松处理命名空间：

$RSS = new SimpleXMLElement($xml); 
$NS = array( 
    'g' => 'http://base.google.com/ns/1.0' 
    // whatever other namespaces you want 
); 
// now register them all in the root 
foreach ($NS as $prefix => $name) { 
    $RSS->registerXPathNamespace($prefix,$name); 
} 
// Then turn $NS to an object for more convenient Syntax 
$NS = (object) $NS; 
// If I need the namespace name later,I access like so: 
$element->addChild('localName','Value',$NS->g);

PHP的SimpleXML：如何在名字中使用冒号

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