How to update a database (d2) based on the informa

问题:

i managed to install xampp with wordpress on localhost. In a subfolder of wordpress i installed a php program. Everything works well, but i have a problem, i want my wordpress members to be able to login and use my php program (a web app). The problem is that's i'm just started to learn php a few weeks ago, so i can't really do it, i don't have money to spend on a developer, so this site is my only help.

I found an easier way for me to do essentially the same, but i have some problems implementing it: i want to link database1 (wordpress database) with database2 (php app database). Essentially i want to update database2 informations based on information on database1, i.e. if someone update his password on wordpress for example i want his password also to be updated on database2, if i delete or add an user on wordpress i want them also to be deleted or added on database2 from my web app.

The informations on the two database are:

database1 table1 user_id email password

database2 table2 ID email password name last name

How can i do this with php & mysql? I really have some difficulties implementing it. Can someone help or at least give me some indication on how to implement it. I'm a newbie.

Thanks to everyone!