PHP 5.5 has been unsupported for more than two years (see: EOL and Supported Versions). The most recent PHP Version Stats (2018.1), which are derived from Composer usage, also report only 3.5% overall usage for PHP 5.5.
This task would entail:
- Bump the version requirement in package.xml
- Remove any compatibility code around macro definitions
- Remove any pre-5.6 SKIPIF checks in test files
- Reach out to remi regarding any downstream changes for Fedora packaging