I want to save a user's email and username when a button is clicked. I assume I have to do this via PHP but I can find the user column at localhost/phpmyadmin. Where is the users' information being stored and which is the MySQL query to achieve that?


You should not use a direct MySQL query to update anything.

In this case you can use user_save(); which it is basically, load the user object -> change data -> pass it to user_save(); or even better user entityAPI and entity_metadata_wrappers

The default table where drupal saves user data is users, there you can find the email and username

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