XPath get attribute value in PHP

Question

Possible Duplicate:
How to extract a node attribute from XML using PHP's DOM Parser

How do I extract an HTML tag value?

HTML:

<input type="hidden" name="text1" id="text1" value="need to get this">

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 value to be "need to get this"?

Update:

I got it working and hope it will help others too. After above code I got the value by:

echo $filtered->item(0)->getAttribute('value');

Solution 1

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 $value property of each attribute node.

Solution 2

Look at this DOM method: http://www.php.net/manual/en/domelement.getattribute.php

$array_result = array();
foreach (filtered as $key => $value) {
    $array_result[] = $value->getAttribute('ID'); 
}

Solution 3

I'm not familiar with the PHP syntax for this, but to select the value attribute you would use the following xpath:

//input[@name='text1']/@value

However xpath doesn't return strings, it returns nodes. You want the nodeValue of the node, so if PHP follows convention, that code would be:

 $xpath->query("//input[@name='text1']/@value")->item(0).nodeValue;

For learning purposes, keep in mind you always check the nodeValue property. So if you wanted the name of the same element, you'd use:

 $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 nodeValue property as well.

Comments

[Gordon]

just closevote please. its a duplicate

[Khurshid Alam]

Doesn't work. error Undefined property: DOMNodeList::$value

[TomoMiha]

this works for me:$res = $xpath->query("//input[@name]/@name"); echo $res->item(0)->nodeValue;

[Peter Krauss]

The simplest way is using evaluate, see stackoverflow.com/a/45010743/287948