public static function getAlias($alias)
    {
        return isset(self::$_aliases[$alias]) ? self::$_aliases[$alias] : null;
    }
public static function getAlias($alias)
    {
        return isset(self::$_aliases[$alias]) ? self::$_aliases[$alias] : null;
    }
public static function getAlias ( $ alias ) { return isset ( self :: $ _aliases [ $ alias ] ) ? self :: $ _aliases [ $ alias ] : null ; }
Get an alias for an identifier

@param  string  The alias
@return mixed   The class indentifier or identifier object, or NULL if no alias was found.
Get an alias for an identifier