Can't find anything on the web for this, wanted to throw the question out there.
Is the a PHP version of CSS Media Queries?
I'm under the assumption that you would want to do this for the purpose of detecting mobile browsers - if not, then this answer is slightly irrelevant.
You can check out Mobile ESP for a mobile User Agent detection library. It's very simple to use and works well in my experiences.
No, there isn't.
The browser doesn't send information on any of its media features to the server, so PHP doesn't have the information needed to implement this.
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