它可能无法在Facebook登录中获取用户电子邮件？

Question

Im with a problem using the Facebook PHP SDK to implement Facebook Login on a Site.

I use an email to identify the users of my app. SO, when a new user logins with Facebook I search if his mail is in the database, if not i create a new user.

The problem is that a small number of users (2 specifically) have problems with the login system. When i checked the database (in the "users" table), i noticed that they have accounts created, but wihouth the email.

The question is: Is possible to not have access to an email of a facebook user if he gave the permissions to the app?

If this is true, exist some kind of solution to use Facebook Login in a system that stores the user with this table?:

email | password | name

Thanks. Sorry for the bad english.

Answer 1

Yes, it is possible that you'll not receive the email of a facebook user inspite of the fact that he gave the required permission to the app.

But chances are very minute (as you've mentioned too- a small number of users (2 specifically) have problems with the login system)

The reason for that? Follow this discussion- Register with Facebook sometimes doesn't provide email

Solution?

It depends why exactly you need an email. If its just an identifier for a user, you can save the username or id of the user (yes those are unique). Yet, this will just be an identifier- but since for the cases you are not getting email, you cant do anything else about that, right?