As seen here: http://wycks.wordpress.com/2013/12/05/how-to-remove-error-notices-using-wordpresss-wp_debug/ In your `wp-content` folder create a new folder called `mu-plugins` and in that folder create a php file with the error level you want, for example:

//Turns off notices
 error_reporting(E_ALL ^ E_NOTICE);

If you are using PHP 5.5 +, you will get deprecated noticed for WordPress’s mysql_* functions, you can turn them off using:

error_reporting(E_ALL & ~E_DEPRECATED & ~E_STRICT);

Or for something really robust, which happens to be the case a lot.

error_reporting(E_ALL & ~( E_DEPRECATED | E_USER_DEPRECATED | E_USER_NOTICE | E_STRICT ));