Using PHP simpleXML to find a node I know the name of but not where it resides

I need to query an XML string in PHP were I know the names of the nodes I am looking for but I might not necessarily know the path to the node.

I think I can do this with xpath but I can't work out how to set up a relative path to look anywhere in the document, could someone point me in the right direction.

I am currently trying to acheive this with simpleXML, but if there is a better way of doing this I would love to hear it.


Don't use regexes to parse XML!

The descendant (double-slash) operator in xpath will search all descendants for a match.

$matches = $simplexmlelementobject->xpath('//nameOfElement');

The above is equivalent to the DOM method getElementsByTagName

If you have a general idea of where the element lives, you can use the descendant operator to search below a certain node:

$matches = $simplexmlelementobject->xpath('someparentelement[@conditionalattr=something]//nameOfDescendantElementYouWant');

If you need to use DOMDocument instead of SimpleXML, you can issue xpath instructions with the DOMXPath object if necessary. (Left as an exercise for the reader.)

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