public static function userExists($username)
	{
		if ( ! is_array( self::$auth ) ) throw new Exception( 'Authentication not initialized' );
		return ( isset( self::$auth['users'][ $username ] ) );
	}
public static function userExists($username)
	{
		if ( ! is_array( self::$auth ) ) throw new Exception( 'Authentication not initialized' );
		return ( isset( self::$auth['users'][ $username ] ) );
	}
public static function userExists ( $ username ) { if ( ! is_array ( self :: $ auth ) ) throw new Exception ( 'Authentication not initialized' ) ; return ( isset ( self :: $ auth [ 'users' ] [ $ username ] ) ) ; }
Tell whether user exists or not

@param string $username the username

@return boolean
Tell whether user exists or not