Why Does My PHP PDO Code Get an 'Unknown Database Error' Despite PHPMyAdmin Showing a Successful Connection?

Database Connectivity Issues: Unknown Error Despite Connection Established in PHPMyAdmin

When connecting to a MySQL database using the PDO library in PHP, a user encountered an "Unknown database error" while attempting to access newly created databases. This issue persisted despite successful connections to pre-existing databases in PHPMyAdmin.

To resolve the problem, it is crucial to consider two potential causes:

1. Spelling Error: Carefully check the database name specified in the PHP code against the actual name created in PHPMyAdmin. Any discrepancies in spelling can lead to connection failures.

2. Different Database Connections: PHPMyAdmin and PHP scripts might be connecting to different database servers. To verify this, execute the following query in both PHPMyAdmin and in PHP:

   SHOW DATABASES;

   Compare the outputs. If there are discrepancies in the database names, it suggests that PHPMyAdmin and PHP are connecting to different servers.

If PHPMyAdmin and PHP are indeed connecting to different servers, the PHP configuration file can be modified to specify the correct server connection information. By resolving these potential causes, the PHP code should be able to establish connections to newly created databases without encountering the "Unknown database error."

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