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The inability to create tables is a separate issue from the inability to connect.
I will assume you’ve not granted permissions for the user you have configured in your PHP script to do anything on that database.
The simplest method is to give the user the correct permission. Assuming you want them to connect via localhost only, and your user’s name is “your_user”, and the password for that use is “some_password”, running this set of queries would fix it for you. Change the database name, user and password to match what you have set in the PHP script:
GRANT ALL PRIVILEGES ON your_database.* TO 'your_user'@'localhost' IDENTIFIED BY 'some_password';
FLUSH PRIVILEGES;
quit;
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