public function alias($alias, $path = null)
	{
		if (is_null($path))
		{
			return $this->aliases[$alias] ?: null;
		}
		else
		{
			$this->aliases[$alias] = $path;
		}
	}
public function alias($alias, $path = null)
	{
		if (is_null($path))
		{
			return $this->aliases[$alias] ?: null;
		}
		else
		{
			$this->aliases[$alias] = $path;
		}
	}
public function alias ( $ alias , $ path = null ) { if ( is_null ( $ path ) ) { return $ this -> aliases [ $ alias ] ? : null ; } else { $ this -> aliases [ $ alias ] = $ path ; } }
Set or get a config alias

@param string $alias
@param string $path
@return string|null
Set or get a config alias