Script that hits form to post a comment

I need a simple PHP script that, when I execute, it will hit form located in [login to view URL] and creates a new comment in that webpage. To simplify, only one comment needs to be created, not multiples ones. If comment if added successfully, you can see it in realtime in that webpage. You must provide me a 100% workind demo before I pick up a coder person if you want to have a chance. Just to clarify, a need a script version that does not require me to fill form manually, your script must publish any random message i pass through a variable via GET method: so that I can execute it using [login to view URL] and your script will post in wordpress page a new comment with message: "ANY_PERSONAL_MESSAGE" This way I can verify if it works. Thank you.