Dom and XPath scraping - What wrong here?

Question

I need to scrape a length of text from a webpage from the internet, I am using the dom and xpath to find the data, however I cant seem to select the exact information I need. He

Answer 1

Running your code, I first get :

Notice: Undefined variable: expr_argos
Warning: DOMXPath::query() [domxpath.query]: Invalid expression

So, first of all, make sure you are using something valid for your XPath query -- for example, you should have this :

$nodes_argos = $xpath_argos->query($expr_currys);

instead of what you currently have :

$nodes_argos = $xpath_argos->query($expr_argos);

Then, you get the following error :

Notice: Trying to get property of non-object

on the following line :

$argos_stock_data = $nodes_argos->item(0)->nodeValue;

Basically, this means you are trying to read a property, nodeValue, on something that is not an object : $nodes_argos->item(0);

I'm guessing your XPath query is not valid ; so, the call to the xpath() method doesn't return anything interesting.

You should check your (quite a bit too long to be easy to understand) XPath query, making sure it matches something in your HTML page.