Sourcerer and GET or POST variables

Hello, I am designing a new website that needs some additional PHP for the users and I have tested the free version of Sourcerer, seems very good so far.

Before going on with purchasing, I need to know if I can post variables between PHP scripts, for example:

User log into Joomla, see an articles (only for registered users) where there is a PHP script included using Sourcerer. This script get some data taken from an external database using a query (since here all is documented), these data are displayed into an html form that the user can edit freely, then the user push "submit" button, send data to another PHP that elaborates and update the DB, then return a response that is shown to the user.

So shortly: Joomla articles with PHP (Sourcerer) and HTML form > send data to another PHP (GET or POST) > get response.

Maybe it is better to use AJAX in the same article (getting response without changing web page), but is that possible?

Is that too complicated? How do you handle that situation at best?

Thanks in advance.

Thank you very much for your answer. One more question to clarify: I have Joomla with SEF and URL Rewrite activated, so I have the article with PHP that is in the URL (for example):
www.domain.com/category/article-alias-1
I want to send the form with GET method to
www.domain.com/category/article-alias-2
Will the PHP in the second article be able to read the GET data? It will not mess up the SEF and Rewrite?
Thanks.

Sorry I did not mean to ask for support, just asking for documentation, because I don't know how the variables could be passed between scripts inside the Joomla environment. Maybe you should add some basic example of HTML forms, that is not very clear from docs4.regularlabs.com/sourcerer/going-further/advanced

Thank you for your answer and for your time, all is clear now.