How can I store JavaScript variable output into a PHP variable?

Question

I have the following code in JavaScript:

PHP Code:-

Answer 1

You really can't. PHP is generated at the server then sent to the browser, where JS starts to do it's stuff. So, whatever happens in JS on a page, PHP doesn't know because it's already done it's stuff. @manjula is correct, that if you want that to happen, you'd have to use a POST, or an ajax.