public function getMap($keys = self::APP)
	{
		return array_column($this->definitions[$keys], self::DEFINITION_MAP, self::DEFINITION_KEY);
	}
public function getMap($keys = self::APP)
	{
		return array_column($this->definitions[$keys], self::DEFINITION_MAP, self::DEFINITION_KEY);
	}
public function getMap ( $ keys = self :: APP ) { return array_column ( $ this -> definitions [ $ keys ] , self :: DEFINITION_MAP , self :: DEFINITION_KEY ) ; }
Returns a map of all defined key names for the given environment.

@param string $keys The environment to use for array keys
@return array
Returns a map of all defined key names for the given environment .