Release Candidate versions are available in remi-test repository for Fedora and Enterprise Linux (RHEL / CentOS) to allow more people to test them. They are available as Software Collections, for a parallel installation, perfect solution for such tests (for x86_64 only), and also as base packages.
RPM of PHP version 7.3.2RC1 are available as SCL in remi-test repository and as base packages in the remi-php73-test repository for Fedora 27-29 and Enterprise Linux.
RPM of PHP version 7.2.15RC1 are available as SCL in remi-test repository and as base packages in the remi-test repository for Fedora 28-29 or remi-php72-test repository for Fedora 26-27 and Enterprise Linux.

