/**
* Generate a cache key for a LESS file.
*
* The cache key varies on the file name and the names and values of global
* LESS variables.
*
* @since 1.22
* @param string $fileName File name of root LESS file.
* @return string: Cache key
*/
protected static function getLESSCacheKey($fileName)
{
$vars = json_encode(ResourceLoader::getLESSVars());
$hash = md5($fileName . $vars);
return wfMemcKey('resourceloader', 'less', $hash);
}
