Alexey - 2015-03-09 12:52:02
Good day!
I may be wrong, but maybe it will helpfull for you to check response of request to any function of Facebook. For now I have a project a music player for vk.com. Oauth is in use there too. I create a desktop application, so I'm use VB.NET, but VB.NET make same request as a PHP, and get same result: json formatted string. So, in this string you may retrive error and handle it. Look here: http://vk.com/dev/auth_sites. Maybe it'll helpfull for you...