php xpath - string functions on a attribute

Question

What is the correct syntax for applying string functions (e.g. "normalize-space") on a attribute using the xpath query below?

Query: "./@media"

I've seen examples of this elsewhere but if I try it using php's xpath library it returns nothing...

Answer 1

Using query() on a DOMXPath object will always result in a node-set (wrapped in a DOMNodeList object), never in a string.

You can't pull out the results of XPath functions. You must query the nodes you want to process, and process them in PHP.

Answer 2

Use evaluate() instead of query(). It will return a typed result. It's available since PHP 5.1.

$doc = new DOMDocument();
$xpath = new DOMXpath($doc);
$q = $xpath->evaluate('"test"');
var_dump($q);

output:

string(4) "test"

Answer 3

./[normalize-space(@media)

Please try this.

Answer 4

How about this?

normalize-space(./@media)

You could also try:

normalize-space(string(./@media))

but I don't think that's neccessary here.