How to Resolve the \"Headers and Client Library Minor Version Mismatch\" Warning in PHP?

Headers and Client Library Minor Version Mismatch: Resolved with mysqlnd

This commonly encountered issue, indicated by the warning "Headers and client library minor version mismatch," arises when there's a discrepancy between the PHP client library and the database server headers.

To resolve this, it's recommended to utilize the mysqlnd driver, which is designed specifically for MySQL/MariaDB compatibility. Installing this driver in PHP using the command sudo apt-get install php5-mysqlnd can rectify the mismatch.

For PHP, if you have both mysqlnd and older mysqli extensions installed, ensure that the mysqlnd extension is enabled and that mysqli is disabled. The following PHP INI configurations can help:

; Extension for handling MySQL
extension=mysqlnd
disable_functions=mysql_connect,mysql_pconnect,mysql_close,mysql_select_db,mysql_query,mysql_fetch_lengths,mysql_stmt_init,mysql_stmt_prepare,
mysql_stmt_execute,mysql_stmt_result_metadata,mysql_stmt_fetch,mysql_stmt_store_result,mysql_stmt_free_result,mysql_stmt_num_rows

If you're using a PDO connection, modifying the PDO connection attributes as follows can further resolve any remaining issues:

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

By employing these approaches, you can eliminate the "Headers and client library minor version mismatch" warning and ensure optimal communication between your PHP code and MySQL/MariaDB databases.

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