Why Does My PHP Code Show an 'Unknown Database Error' While PHPMyAdmin Can Access the Database?

Unknown Database Error in PHP Despite Its Existence in PHPMyAdmin

Problem:

While using PHP's PDO extension to connect to MySQL, you encounter an "Unknown database error" when accessing databases you create, but you can connect to pre-existing ones.

Answer:

1. Spelling Error:

Check the database name spellings to ensure there are no mistakes.

2. Differing Database Connections:

Verify that PHP and PHPMyAdmin are connecting to the same database. You can check this by running the query "show databases" in PHPMyAdmin and in your PHP code using PDO or mysqli. The outputs should match.

If there's a mismatch, check your PHP configuration files or PHPMyAdmin configuration files to ensure they connect to the proper database server.

Specific PHPMyAdmin Verification:

To verify which database PHPMyAdmin is using:

1. Go to Operations -> Database in PHPMyAdmin.
2. The database name will be displayed in the Current Database field.
3. Confirm that this name matches the database you're trying to access in PHP.

Troubleshooting Tips:

• If you've ensured there are no spelling errors and the database connections are correct, try creating the database again with proper permissions.
• Restart your PHP script and PHPMyAdmin.
• Double-check the user privileges for the database you're trying to access.
• Consult the MySQL documentation or forums for further assistance.

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