RPM of PHP version 7.0.6 are available in remi-php70 repository for Fedora and Enterprise Linux (RHEL, CentOS).
RPM of PHP version 5.6.21 are available in remi repository for Fedora ≥ 21 and remi-php56 repository for Fedora and Enterprise Linux.
RPM of PHP version 5.5.35 are available in remi repository for Fedora 20 and in remi-php55 repository for Enterprise Linux.
PHP version 5.4 have reached its end of life and is no longer maintained by the project. Given the very important number of downloads by the users of my repository the version is still available in remi repository for Enterprise Linux (RHEL, CentOS...) and includes security fix (from version 5.5.35). The upgrade to a maintained version is strongly recommended.
These versions are also available as Software Collections.
These versions fix some security bugs, so update is strongly recommended.