Append href attribute in hyperlinks with URL in PHP and DOM

I'm using DOM's loadHTMLFile to grab a page from elsewhere.

I need to find all hyperlinks on the page and then append them so they begin with another, fixed address. E.G.:

Take:

<a href="http://www.google.com"> Google yay! </a>

And turn it into:

<a href="http://cheese.com/http://www.google.com"> Google yay! </a>

Unsure of how to go about doing this. Many thanks in advance for any help. E-Beer for the correct answer.

use $dom->getElementsByTagName('a') to get a nodeList. Check if the ->length is greater than 0. If so, iterate with a foreach or for loop using the ->length as the counter and $nodelist->item($i). Grab the ->getAttribute('href'). If it matches a certain pattern using regex testing, then $el->setAttribute($newhref);