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Is there a way to search for an image and retrieve the url for it using php for another site, sort of like using get_meta_tags, or for example something like the facebook micropublisher, when you paste a url inside, it grabs an image associated with the site, is there a way to do this? any help would be greatly appreciated.
If you load the page in an XML DomDocument you can use Xpath to retrieve all Image tags. This would even allow you to create a Facebook like pager, so you can chose from several images.
PHP: Dom Document