Why Does My PHP Code Get an \'Unknown Database Error\' Even Though the Database Exists?

Troubleshooting Unknown Database Errors with PHP

In PHP, connecting to a MySQL database can sometimes result in an unknown database error, even though the database exists. This discrepancy can occur when the PHP code and PHPMyAdmin are referencing different databases.

To resolve this issue, the first step is to verify the spelling of the database name. A simple spelling error can prevent the code from establishing a connection to the intended database.

If the database name is accurate, the next consideration is whether PHPMyAdmin and PHP are connecting to the same database server. This can be determined by running the following query in both PHPMyAdmin and the PHP code:

SHOW DATABASES;

Comparing the output of this query will reveal if the PHP code and PHPMyAdmin are connected to different databases.

If the output differs, it indicates that the code is attempting to connect to a different database than PHPMyAdmin. This can occur if there are multiple database servers installed on the computer. To resolve this issue, check the PHP configuration file and ensure that it specifies the correct database server to connect to.

Once the correct database server is identified, the PHP code should be able to connect to the existing database without encountering the "Unknown database error."

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