core-bundle/src/Resources/contao/library/Contao/Combiner.php
public function getCombinedFile($strUrl=null)
	{
		if (Config::get('debugMode'))
		{
			return $this->getDebugMarkup();
		}

		return $this->getCombinedFileUrl($strUrl);
	}
public function getCombinedFile($strUrl=null)
	{
		if (Config::get('debugMode'))
		{
			return $this->getDebugMarkup();
		}

		return $this->getCombinedFileUrl($strUrl);
	}
Generate the combined file and return its path

@param string $strUrl An optional URL to prepend

@return string The path to the combined file