Heroku is PasS environment which supports PHP unofficially. It is missing some of extensions initially. One instance is mbstring. However I noticed that mbstring is able to build on heroku run bash
and can be loaded from project local php.ini configuration.
I put the mbstring.so on github. If you need it, just copy into your project and put php.ini which include:
extension=/app/www/mbstring.so
Example
This application is running on heroku with mbstring.
Enjoy php on heroku!
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