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This plugin adds an improved database layer to WordPress. It allows you to do more then the default one and is always up-to-date with the changes core makes.
mysql_* functions
The mysql_* functions are officially deprecated for PHP 5.5 and are throwing E_DEPRECATED errors.
On https://core.trac.wordpress.org/ticket/21663 there is discussion on this topic.
This plugin reflects those discussions.
Why should I use this plugin?
You should use this plugin if you want to start using PDO / MySQLi for WordPress.
Screenshots
The main settings page reports on what database drivers your PHP installation supports and lets you enable or disable the custom db.php drop-in for this plugin.