public static function invalidate(FileSystemCacheKey $key) {
		$filename = $key->getFileName();
		if(file_exists($filename)) {
			try{
				unlink($filename);
			} catch (\Exception $ex) {
			}
		}
		return true;
	}
public static function invalidate(FileSystemCacheKey $key) {
		$filename = $key->getFileName();
		if(file_exists($filename)) {
			try{
				unlink($filename);
			} catch (\Exception $ex) {
			}
		}
		return true;
	}
public static function invalidate ( FileSystemCacheKey $ key ) { $ filename = $ key -> getFileName ( ) ; if ( file_exists ( $ filename ) ) { try { unlink ( $ filename ) ; } catch ( \ Exception $ ex ) { } } return true ; }
Invalidate a specific cache key
@param FileSystemCacheKey $key The cache key
@return boolean True on success.  Currently never returns false.
Invalidate a specific cache key