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Connecting/combining multiple user tables in a MySQL database for different PHP applications on a server subdomains/subfolders

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You would need to create a single table for your users info like name,mail,password, etc.

Then create a new table to assign an id to each app you want to manage.

Finally you'll need a permissions table with an id_user column and an id_app column to bind the app to your user.

In each app you'll need to specify its "id" based on the apps table you created before. When a user logs in simply store in an SESSION array all the id_app values from the permissions table where the user's id appears and use in_array function to verify if the user is allowed to access the app.

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2023-09-28

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2023-09-28

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About the technologies asked in this question

PHP

PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites. The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/

MySQL

DBMS is a database management system. It is designed to change, search, add and delete information in the database. There are many DBMSs designed for similar purposes with different features. One of the most popular is MySQL. It is a software tool designed to work with relational SQL databases. It is easy to learn even for site owners who are not professional programmers or administrators. MySQL DBMS also allows you to export and import data, which is convenient when moving large amounts of information.
https://www.mysql.com/