如何通过xpath获取每个节点的属性

Question

如何通过xpath获取每个节点的属性？

例如，

是book.xml，

​​

PHP，

<?php 

$doc = new DOMDocument; 

$doc->load('book.xml'); 

$xpath = new DOMXPath($doc); 

# get and output "<entry>" elements 
$x = $doc -> getElementsByTagName('record'); 

# Count the total feed with xpath. 
$total = $x->length; 

# the query is relative to the records node 
$query = 'string(/records/@timestamp)'; 

for ($i=0; $i<$total; $i++) 
{ 
    $timestamp = $xpath->evaluate($query,$x->item($i)); 
    echo $timestamp ."<br/>"; 
} 

?> 

结果（它仅循环的第一个节点），

1264777862 
1264777862 
1264777862 
1264777862 

但我想得到，

1264777862 
1264777000 

我已按照here的问题和答案进行了修改。

或者也许有更好的方法？

编辑：

XML，

<?xml version="1.0" encoding="UTF-8" ?> 
<records> 
    <record timestamp="1264777862">A</record> 
    <record>B</record> 
    <record timestamp="1264777000">C</record> 
    <record>D</record> 
</records> 

与此，

for ($i=0; $i<$total; $i++) 
{ 
    $value = $x->item($i)->childNodes->item(0)->nodeValue; 
    $timestamp = $xpath->evaluate($query,$x->item($i)); 
    echo $value.': '.$timestamp ."<br/>"; 
} 

我得到这样的结果，

A: 1264777862 
B: 1264777862 
C: 1264777862 
D: 1264777862 

但这是结果我之后，

A: 1264777862 
B: 
C: 1264777862 
D: 

编辑：

测试，

$nodes = $xpath->query('//records/record'); 

foreach($nodes as $node) { 
    $value = $node->nodeValue; 
    $timestamp = $node->getAttribute('timestamp'); 
    echo $value .': '."<br/>"; 
} 

结果，

A: 
B: 
C: 
D: 

Answer 1

一种方法：

$nodes = $xpath->query('//records[@timestamp]'); 
foreach($nodes as $node) { 
    $timestamp = $node->getAttribute('timestamp'); 
} 

虽然，您在示例中混合了record和records，所以我不确定您在实际中使用了哪个。

---

更新：此代码的工作对我来说：

<?php 

$xml = <<<EOL 
<?xml version="1.0" encoding="UTF-8" ?> 
<records> 
    <record timestamp="1264777862">A</record> 
    <record>B</record> 
    <record timestamp="1264777000">C</record> 
    <record>D</record> 
</records> 
EOL; 

$x = new DOMDocument(); 
$x->loadXML($xml); 

$xp = new DOMXpath($x); 

$nodes = $xp->query('//records/record'); 
foreach($nodes as $node) { 
    echo $node->nodeValue, ': ', $node->getAttribute('timestamp'), "\n"; 
} 

和输出

A: 1264777862 
B: 
C: 1264777000 
D: