PHP + XPath 查询获取子节点及其值

Question

我有一个 XML 文件 record.xml，它看起来像:

<record>
    <name>john</name>
    <gender>male</gender>
    <subject>mathematics, english, science</subject>
</record>
<record>
    <name>jamie</name>
    <gender>female</gender>
    <subject>mathematics, science</subject>
</record>
<record>
    <name>jack</name>
    <gender>male</gender>
    <subject>social-science, english</subject>
</record>

我想编写一个 xpath 查询，它将返回 <record> 的所有子节点名称以及关联数组中所有这些子节点的值。

For Ex.:

For above XML file Output array should be-

array{
     [0] => array{
                 [name] = 'john',
                 [gender] = 'male',
                 [subject] = 'mathematics, english, science' 
            }
     [1] => array{
                 [name] = 'jamie',
                 [gender] = 'female',
                 [subject] = 'mathematics, science' 
            }
     [2] => array{
                 [name] = 'jack',
                 [gender] = 'male',
                 [subject] = 'social-science, english' 
            }
}

下面是我写的部分代码返回所有<record>子节点值而不是它们的节点名称。

    .......
    .......
    $xmldoc = new DOMDocument();
    $xmldoc->load('record.xml');
    $xpathvar = new Domxpath($xmldoc);
    $res = $xpathvar->query('//record');
    foreach($res as $data){
            //$data do not contain node values
           $arr[] = $data->textContent;
    }
    //process $arr to get required format
     .....
     .....

我只想要一个 Xpath 查询，它将返回子节点名称及其值。

Answer 1

问题是记录，因为节点只是节点层次结构的一部分。您得到的是所有记录，但是您还想下降并从记录的子节点获取数据。一个非常具体的例子是:

<?php     
$xmldoc = new DOMDocument();
$xmldoc->load('record.xml');
$xpathvar = new Domxpath($xmldoc);
$res = $xpathvar->query('//record');
foreach($res as $data){
    $narr = [];
    foreach ($data->childNodes as $cnode) {
        $narr[$cnode->nodeName] = $cnode->nodeValue;
    }
    $arr[] = $narr;

}    
print_r($arr);

应该输出如下内容:

Array
(
    [0] => Array
        (
            [name] => john
            [gender] => male
            [subject] => mathematics, english, science
        )

    [1] => Array
        (
            [name] => jamie
            [gender] => female
            [subject] => mathematics, science
        )

    [2] => Array
        (
            [name] => jack
            [gender] => male
            [subject] => social-science, english
        )

)

注意:此解决方案非常具体，如果您有额外的嵌套层次结构(我建议您这样做以存储多个主题)，则可能会中断。