Access a JavaScript variable from PHP

Question

I need to access a JavaScript variable with PHP. Here\'s a stripped-down version of the code I\'m currently trying, which isn\'t working:

Answer 1

I'm looking at this and thinking, if you can only get variables into php in a form, why not just make a form and put a hidden input in the thing so it doesn't show on screen, and then put the value from your javascript into the hidden input and POST that into the php? It would sure be a lot less hassle than some of this other stuff right?