PHP SimpleXML xpath 正在获取一个空数组-解网

问：

我正在尝试使用 xpath 函数从 XML 文件中获取信息。出于某种原因，它不断返回一个空数组。

XML 文件

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
 <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme" Target="theme/theme1.xml"/>
 <Relationship Id="rId2" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/settings" Target="settings.xml"/>
 <Relationship Id="rId3" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/fontTable" Target="fontTable.xml"/>
 <Relationship Id="rId4" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/numbering" Target="numbering.xml"/>
 <Relationship Id="rId10" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image" Target="media/image1.png"/>
 <Relationship Id="rId9" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink" Target="https://test.com/" TargetMode="External"/>
 <Relationship Id="rId5" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles" Target="styles.xml"/>
 <Relationship Id="rId6" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink" Target="https://youtu.be/" TargetMode="External"/>
 <Relationship Id="rId7" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink" Target="https://youtu.be/" TargetMode="External"/>
 <Relationship Id="rId8" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink" Target="https://youtu.be/" TargetMode="External"/>
</Relationships>

做一个简单的

 $relationships=simplexml_load_file('document.xml.rels');
 print_r($relationships);
 // prints full xml perfectly

 print_r($relationships->xpath('//Relationship'));
 // prints empty array: Array()

为什么打印一个空数组？$relationships->xpath('//Relationship')

例如，我的目标是通过使用来选择关系，但甚至不起作用？Id->xpath('//Relationship[@Id="rId7"]')->xpath('//Relationship')

注意：我也尝试过使用，但没有成功。var_dump()

php xml xpath simplexml

$relationships=simplexml_load_file('document.xml.rels');
print_r($relationships);
// prints full xml perfectly

foreach($relationships->getDocNamespaces() as $strPrefix => $strNamespace) {
    if(strlen($strPrefix)==0) {
        $strPrefix="a"; //Assign an arbitrary namespace prefix.
    }
    $relationships->registerXPathNamespace($strPrefix,$strNamespace);
}

echo "<br><br>PRINTING<br><br>";

print_r($relationships->xpath('//a:Relationships'));

这将打印内容。Relationships

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