Possible to "exclude" folders from inside a plugin .jar file?

The php project I'm working on has a class named HttpRequest.  Everywhere this is referenced, I get a warning: "Multiple definitions exist for class HttpRequest".  The conflict is with a class in jetbrains php.jar, for the php plugin.  I know I can get rid of these warnings for duplicate classes that are both in my project files by marking the irrelevant directory as Excluded.  But I haven't been able to get this to work for the "directory" inside the jar file.  Is there any way I can tell it to ignore the HttpRequest inside php.jar and get rid of this warning?

Thanks!