When you execute a PHP script from another PHP script and pass data using URL parameters, those parameters are visible on the address bar. A user can see and change the parameters. It's possible ...

Sadly, that simple concept is often misconstrued. While the URL path component is what should point directly at the server-side resource, many well-meaning developers fall into the trap of the RESTful ...

If you use Firefox, you can enable Query Parameter stripping by going to about:config, which you can type into the URL bar, and setting privacy.query_stripping.enabled.pbmode to true.