Why Am I Getting \"Headers and client library minor version mismatch\" Error When Using mysql_connect in PHP?

Headers and Client Library Minor Version Mismatch

When connecting to a database using PHP via mysql_connect, you may encounter the following warning if the minor versions of the client library and MySQL server headers do not match:

Warning: mysql_connect(): Headers and client library minor version mismatch. Headers:50162 Library:50524

Verifying Version Information

To gather information about the PHP-MySQL interface, run php -i and examine the values under the mysqli section. If the 'Client API header version' and 'Client API library version' differ, you have a mismatch.

Updating the MySQL Client Library

In some cases, updating the PHP-MySQL package and PHP may resolve the issue. However, if the latest versions are already installed, consider the following alternative solutions:

1. Switch to the mysqlnd Driver

The mysqlnd driver is recommended by MariaDB. To install it on Ubuntu systems:

sudo apt-get install php5-mysqlnd

2. Recompile PHP with MariaDB Client Libraries

Rebuild PHP with the MariaDB client libraries to ensure compatibility.

3. Use Original MySQL Client Library with MariaDB

If possible, use the original MySQL client library with MariaDB. This approach may require additional configuration.

Additional Information

For users encountering issues with PDO returning integer values as strings, installing the mysqlnd driver can resolve the problem. Additionally, setting the following attributes in the PDO connection may be necessary:

<code class="php">PDO::ATTR_EMULATE_PREPARES
PDO::ATTR_STRINGIFY_FETCHES</code>

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