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First step to manually parsing HTML is to stop manually parsing HTML. Use DOM instead.

Basically what is being described to you is a race condition. You aren't going to be able to hack around it. A PHP script runs on the server, and has "page/request" scope. The client provide an HTTP request, and the server provides an HTTP response, and the connection is closed. Ajax is used to make changes to the state of a fully rendered DOM on the client. You are not going to be able to trick PHP into doing some of its work -- delaying while the client's DOM is in a partial/indeterminate state, in order for ajax to spawn another request, and then have the original PHP script resume in the way you hope it will, all so that you can get access to session variables that didn't even exist when the original HTTP request was made. I have no idea why you are trying to store some client state in a session, given that browser dimensions are dynamic, relative to the device and decisions made by the client. It's not clear what you expect to do with these dimensions, which you're getting from javascript code, but you certainly don't need to put them into a session, and you haven't made an attempt to explain what problem you are trying to solve, but this is not the way to solve whatever problem that is. If you want to actually take the time to explain the "problem to be solved" we might be able to better advise you on ways to solve it.