XPath get attribute value in PHP [duplicate]

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');

You will have to loop over your filtered elements $filtered via foreach ($filtered as $element) { ... }and check the node values / attributes yourself. — Smamatti
– Smamatti, Commented Nov 6, 2011 at 13:37
One option is the less-used evaluate() method, which will return the text or an empty string: $xpath->evaluate('string(//input[@name="text1"]/@value)'); — salathe
– salathe, Commented Nov 6, 2011 at 14:24
This isn't really an exact duplicate of the other question. This one is really a cross-environment xpath solution, the other is php specific. — Factor Mystic
– Factor Mystic, Commented Sep 9, 2012 at 22:12

Martin Honnen · Accepted Answer · 2011-11-06 13:52:07Z

41

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.

answered Nov 6, 2011 at 13:52

Martin Honnen

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1 Comment

Gordon Over a year ago

just closevote please. its a duplicate

pevik · Accepted Answer · 2020-08-30 16:12:18Z

14

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'); 
}

edited Aug 30, 2020 at 16:12

pevik

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answered Nov 6, 2011 at 13:35

TROODON

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Comments

fearphage · Accepted Answer · 2019-03-09 05:42:58Z

10

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.

edited Mar 9, 2019 at 5:42

answered Nov 6, 2011 at 13:51

fearphage

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3 Comments

Khurshid Alam Over a year ago

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

TomoMiha Over a year ago

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

Peter Krauss Over a year ago

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

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