$HTTP_COOKIE_VARS

you get it with this

webune/forums/get-screen-resolution-with-php.html<a href="webune/forums/get-screen-resolution-with-php.html" title="get screen resolution with php">get screen resolution with php</a>[url=webune/forums/get-screen-resolution-with-php.html]get screen resolution with php[/url]



https://www.webune.com/forums/get-screen-resolution-with-php.html

the pages you make (as php developer) could use client-side javascript to detect the local screen resolution. then, theoretically, you could send an ajax message back to the server, to set a session variable, so all subsequent requests could be either dynamically generated, with differing image sizes, or you could, maybe, use url-rewriting to redirect to the right static html.