Change effective on 10 March 2016
PHP applications on Heroku may now use the following new or updated extensions:
ext-gmp(bundled with PHP)
ext-ldap(bundled with PHP; includes SASL support)
ext-newrelic(version 6.0.1; auto-installed if the New Relic add-on is detected)
ext_apcu extension for PHP 7 now includes the
apcu_bc compatibility module, providing an
ext-apc compatibility layer for older software.
The builds for runtimes, extensions, web servers and libraries have been heavily optimized for reduced size, resulting in faster builds and boots due to significantly (~85%) smaller slugs.
Any platform packages listed in a project’s root
conflict sections are now ignored when resolving what platform packages to install.