通過在屬性中選擇xml節點php

Question

如何通過知道屬性值而無需遍歷每個子節點和每個屬性/值來查找節點值？

$dom = new DOMDocument; 
$dom->load('test.xml'); 

$rows = $dom->getElementsByTagName('row'); 

foreach ($rows as $row) { 

$header = VALUE OF <field name="header"> 
$text = VALUE OF <field name="text"> 

} 

XML：

<resultset> 
    <row> 
    <field name="item">2424</field> 
    <field name="header">blah blah 1</field> 
    <field name="text" xsi:nil="true" /> 
    ... 
    </row> 

    <row> 
    <field name="item">5321</field> 
    <field name="header">blah blah 2</field> 
    <field name="text">some text</field> 
    ... 
    </row> 
</resultset> 

Answer 1

最簡單的事情是用DOMXPath::query^docs

下面的代碼發現，有一個名字屬性等於「頭」 <row>節點內的所有<field>節點：

$dom = new DOMDocument; 
$dom->loadXML($str); // where $str is a string containing your sample xml 
$xpath = new DOMXPath($dom); 
$query = "//row/field[@name='header']"; 

$elements = $xpath->query($query); 

foreach ($elements as $field) { 
    echo $field->nodeValue, PHP_EOL; 
} 

使用樣本e xml你提供，上面的輸出：

blah blah 1 
blah blah 2