How to host Facebook app in Heroku?

Question

I have my Facebook app running without any problem in my localhost. But when I hosted it in Heroku, I got these problems.

The problem is when the user gets redirected from Facebook after login and permissions it shows blank page, and in Heroku logs it shows:

"NOTICE: PHP message: PHP Fatal error: Call to undefined function Facebook\HttpClients\mb_strlen() in /app/facebook/facebook- sdk/src/Facebook/HttpClients/FacebookCurlHttpClient.php on line 300"

I think the error is in mb_strlen() function. I do not know how to rectify it.

I suspect you'll need to enable the mbstring module? See here: php.net/manual/en/book.mbstring.php — halfer
– halfer, Commented Aug 10, 2014 at 17:08
Actually, Thats the problem...I do no how to enable mbstring in heroku...i can do it in my localhost — SreBalaji Thirumalai
– SreBalaji Thirumalai, Commented Aug 11, 2014 at 14:12
This search gave me this Heroku article - search for 'The following built-in extensions have been built “shared”'. — halfer
– halfer, Commented Aug 11, 2014 at 14:15

halfer · Accepted Answer · 2014-08-11 15:25:06Z

The mbstring extension can be turned on in Heroku using Composer. Just use the mbstring dependency and Heroku will do the rest.

I expect it would look something like this:

{ "require": { "ext-mbstring": "*", } }

Of course, if you have other requires at present, you should add this to them, not replace them.

Here's the documentation you need.

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