XPath 获取 PHP 中的属性值
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XPath get attribute value in PHP
提问by jerrymouse
Possible Duplicate:
How to extract a node attribute from XML using PHP's DOM Parser
How do I extract an HTML tag value?
如何提取 HTML 标记值？
HTML:
HTML：
<input type="hidden" name="text1" id="text1" value="need to get this">
PHP:
PHP：
$homepage = file_get_contents('http://www.example.com');
$doc = new DOMDocument;
$doc->preserveWhiteSpace = false;
@$doc->loadHTML($homepage);
$xpath = new DOMXpath($doc);
$filtered = $xpath->query("//input[@name='text1']");
How do I get valueto be "need to get this"?
我如何value成为“需要得到这个”？
Update:
更新：
I got it working and hope it will help others too. After above code I got the value by:
我让它工作了，希望它也能帮助其他人。在上面的代码之后，我通过以下方式获得了价值：
echo $filtered->item(0)->getAttribute('value');
回答by Martin Honnen
XPath can do the job of getting the value attribute with $xpath->query("//input[@name='text1']/@value");. Then you can iterate over the node list of attribute nodes and access the $valueproperty of each attribute node.
XPath 可以完成获取 value 属性的工作$xpath->query("//input[@name='text1']/@value");。然后您可以遍历属性节点的节点列表并访问$value每个属性节点的属性。
回答by TROODON
Look at this DOM method: http://www.php.net/manual/en/domelement.getattribute.php
看看这个DOM方法：http: //www.php.net/manual/en/domelement.getattribute.php
var array_result = array();
foreach (filtered as $key => $value){
$array_result[] = $value->getAttribute('ID');
}
回答by fearphage
I'm not familiar with the PHP syntax for this, but to select the value attribute you would use the following xpath:
我不熟悉 PHP 语法，但要选择 value 属性，您将使用以下 xpath：
//input[@name='text1']/@value
However xpath doesn't return strings, it returns nodes. You want the nodeValueof the node, so if PHP follows convention, that code would be:
但是 xpath 不返回字符串，它返回节点。您需要nodeValue节点的 ，因此如果 PHP 遵循约定，则该代码将是：
$xpath->query("//input[@name='text1']/@value")->item(0).nodeValue;
For learning purposes, keep in mind you always check the nodeValueproperty. So if you wanted the name of the same element, you'd use:
出于学习目的，请记住您始终检查该nodeValue属性。因此，如果您想要相同元素的名称，则可以使用：
$xpath->query("//input[@name]/@name")->item(0).nodeValue;
You'd probably like to make sure the query returns a non-null value before querying the nodeValueproperty as well.
在查询nodeValue属性之前，您可能还想确保查询返回非空值。
