Change effective on 29 April 2016
The following new runtime versions for PHP applications are now available on Heroku:
The following extensions have been updated:
ext-apcuversion 4.0.11 (for PHP 5)
ext-mongoversion 1.6.14 (for PHP 5)
blackfire binary for CLI profiling is now included with the Blackfire extension.
php-cgi binary is now included with PHP runtimes.