How to save data step by step using php and mysql?

Question

I am making a production system using php and mysqli.u remember about credit card payment system wich is a step by step onclick opening an other windows adding informations about the paiement ?do u have any project about this one?
https://code.sololearn.com/WDznpLtN7Mt6/?ref=app
https://code.sololearn.com/WcGPlm3osuKL/?ref=app

Answer 1

Here's a tutorial.
https://www.w3schools.com/php/php_mysql_connect.asp