>Have somebody any idea how I could do something like that?

<snip javascript and PHP>

You're somewhat out of luck, as the chain of events in your typical HTTP
transaction looks something like this...

        ---->[time]--------------------------------->
        client request received from browser
         |
         +-> PHP code executed on server
              |
              +-> text output to webserver (including javascript source)
                   |
                   +-> [drawing of cloud representing internet]
                        |
                        +-> text input to web browser on client side
                             |
                             +-> javascript executed by client
        ---->[time]--------------------------------->

...The only way to have the javascript affect the PHP, is to make a
subsequent request /back/ to the server after the javascript has started
executing. You can, for example, package the screen size into a GET
variable appended to an image request.

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