在PHP中解析XML将返回SimpleXMLElement对象。接下来是什么？

问题描述：

下面是我在尝试解析从美国国会图书馆SRU服务返回的书籍搜索XML代码时得到的回复。如何查看[recordData] => SimpleXMLElement对象以获取标题，创建者和发布者信息？这是我第一次深入研究XML。任何帮助将不胜感激。这是我得到的回应。我发现代码来处理名称空间，但无法弄清楚如何超越recordData标签。在PHP中解析XML将返回SimpleXMLElement对象。接下来是什么？

SimpleXMLElement Object 
     (
      [version] => 1.1 
      [numberOfRecords] => 1 
      [records] => SimpleXMLElement Object 
       (
        [record] => SimpleXMLElement Object 
         (
          [recordSchema] => info:srw/schema/1/dc-v1.1 
          [recordPacking] => xml 
          [recordData] => SimpleXMLElement Object 
           (
           ) 

          [recordPosition] => 1 
         ) 

       ) 


     $entry=simplexml_load_file('xml_data.xml'); 
     $namespaces = $entry->getNameSpaces(true); 
     $yr = $entry->children($namespaces['zs']); 
     print_r($yr); 


     <zs:searchRetrieveResponse xmlns:zs="http://www.loc.gov/zing/srw/"> 
     <zs:version>1.1</zs:version> 
     <zs:numberOfRecords>1</zs:numberOfRecords> 
     <zs:records> 
     <zs:record> 
     <zs:recordSchema>info:srw/schema/1/dc-v1.1</zs:recordSchema> 
     <zs:recordPacking>xml</zs:recordPacking> 
     <zs:recordData> 
     <srw_dc:dc xmlns:srw_dc="info:srw/schema/1/dc-schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://purl.org/dc/elements/1.1/" xsi:schemaLocation="info:srw/schema/1/dc-schema http://www.loc.gov/standards/sru/resources/dc-schema.xsd"> 
     <title>My life /</title> 
     <creator>Clinton, Bill, 1946-</creator> 
     <type>text</type> 
     <publisher>New York : Knopf,</publisher> 
     <date>2004.</date> 
     <language>eng</language> 
     <description>Includes index.</description> 
     <subject>Clinton, Bill, 1946-</subject> 
     <subject>Clinton, Bill, 1946---Family.</subject> 
     <subject>Clinton family.</subject> 
     <subject>Presidents--United States--Biography.</subject> 
     <coverage>United States--Politics and government--1993-2001.</coverage> 
     <identifier> 
     http://www.loc.gov/catdir/samples/random051/2004107564.html 
     </identifier> 
     <identifier> 
     http://www.loc.gov/catdir/description/random051/2004107564.html 
     </identifier> 
     <identifier>URN:ISBN:0375414576</identifier> 
     </srw_dc:dc> 
     </zs:recordData> 
     <zs:recordPosition>1</zs:recordPosition> 
     </zs:record> 
     </zs:records> 
     </zs:searchRetrieveResponse>

答

见文档：

http://us3.php.net/SimpleXMLElement

一个简单的例子示出有：

foreach($xmldata->children() AS $child) 
{ 
    //run any query you want on the children.. they are also nodes. 
    $name = $child->getName(); 
}

在PHP中解析XML将返回SimpleXMLElement对象。接下来是什么？

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