SimpleXML 根据属性值获取元素内容 [英] SimpleXML get element content based on attribute value

问题描述

我正在尝试根据属性的值访问元素的内容.使用 PHP SimpleXML.我有以下 XML 设置:

I'm trying to access the content of an element based on the value of an attribute. With PHP SimpleXML. I've got the following XML setup:

<DocSum> 
    <Id>21242919</Id> 
    <Item Name="Author" Type="String">Nguyen T</Item>
    <Item Name="Title" Type="String">[Hemoptysis and spontaneous rupture of a primary renal angiosarcoma: a case report.]</Item>
</DocSum>
<DocSum> 
    <Id>21242919</Id> 
    <Item Name="Author" Type="String">Oliveira GC</Item>
    <Item Name="Title" Type="String">Disclosing ambiguous gene aliases by automatic literature profiling.</Item>
</DocSum>
<DocSum> 
    <Id>21242919</Id> 
    <Item Name="Author" Type="String">Vanderwall DE</Item>
    <Item Name="Title" Type="String">Metformin and digestive disorders.</Item>
</DocSum>

这些是书.在这种情况下，我试图获得标题.我到目前为止是这样的:

These are books. In this case I'm trying to get the title. What I have so far is this:

$xml = simplexml_load_file(url);
$docs = $xml->DocSum;
foreach($docs as $book){
        // Each book individual
}

评论在哪里我尝试了很多东西.

Where the comment is I tried a lot of things.

推荐答案

这个 XPath 查询在 SimpleXML 对象上将返回所有 DocSum 节点，这些节点具有 Item 子节点，Name 属性中的值为Author"，值为Olivera GC"在文本节点中:

This XPath query on the SimpleXML object will return all DocSum nodes that have an Item child with value "Author" in the Name attribute and value "Olivera GC" in the text node:

$nodes = $xml->xpath('//DocSum[Item[@Name="Author" and .="Oliveira GC"]]');
$book = $nodes[0];
print_r($book);

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