php loading javascript.

Currently i have php scripts i wrote which scrape gogle and bing image search, when one d]performs an image search on either google or bing they have access to about 600 images all on the first page, however i simply grab the page with file_get_contents() and therefore I am unable to grab all those images with one page download. I need a piece of php code which allows me to load the javascript from google and bing image search so that i can receive a string which contains all 600 image urls from a single query.