WordPress local dev tips: DB & plugins by Mark https://markjaquith.wordpress.com/2011/06/24/wordpress-local-dev-tips/

.gitignore

/dir-that-contains-wp-config/local-config.php

wp-config.php

if ( file_exists( dirname( __FILE__ ) . '/local-config.php' ) ) {
  include( dirname( __FILE__ ) . '/local-config.php' );
  define( 'WP_LOCAL_DEV', true ); // We'll talk about this later
} else {
  define( 'DB_NAME',     'production_db'       );
  define( 'DB_USER',     'production_user'     );
  define( 'DB_PASSWORD', 'production_password' );
  define( 'DB_HOST',     'production_db_host'  );
}

wp-config2.php

if ( !defined( 'SCRIPT_DEBUG' ) )
  define( 'SCRIPT_DEBUG', false );