Headers and Client Library Minor Version Mismatch: How Do I Fix It?

Headers and Client Library Minor Version Mismatch: Resolving the Issue

When attempting to connect to a database using PHP's mysql_connect function, you may encounter the following warning:

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

This mismatch can occur when the client library version used by PHP differs from the header version provided by the MySQL server. To resolve this issue, it is essential to update the headers to match the client library.

Updating Header Versions

If you have already updated both php5-mysql and php, the mismatch could still persist. The headers can be updated by following these steps:

1. Upgrade to the Latest Version of MySQL

Ensure that all your MySQL files are up-to-date. Run the following command:

$ apt-get install mysql.*5.5

2. Install the mysqlnd Driver

For MariaDB users, it is recommended to switch to the mysqlnd driver in PHP. This can be installed using the following command:

sudo apt-get install php5-mysqlnd

Once the driver is installed, the problem should be resolved.

Alternative Solutions

If the recommended solution does not resolve the issue, consider the following alternatives:

• Recompile PHP with the MariaDB client libraries (not recommended for beginners).
• Use the original MySQL client library with MariaDB (deprecated).

Additional Information

Emulating Prepared Statements and Integer Representation

After installing the mysqlnd driver, you may need to modify the PDO connection parameters to prevent integer values from being returned as strings. To do this, set the following attributes after creating the PDO object:

$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$db->setAttribute(PDO::ATTR_STRINGIFY_FETCHES, false);

By following these steps, you can resolve the headers and client library minor version mismatch issue and establish a stable connection to your database.

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