public function getKey($env, $key)
	{
		$map = $this->getMap($env);

		return isset($map[$key]) ? $map[$key] : null;
	}
public function getKey($env, $key)
	{
		$map = $this->getMap($env);

		return isset($map[$key]) ? $map[$key] : null;
	}
public function getKey ( $ env , $ key ) { $ map = $ this -> getMap ( $ env ) ; return isset ( $ map [ $ key ] ) ? $ map [ $ key ] : null ; }
Look up a specific environment key by its mapped key.

@param string $env
@param string $key
@return null|string
Look up a specific environment key by its mapped key .