No repo Perguntas frequentes :
php-* packages are standard ones:
- they override the default system version (still an admin choice, as you have to enable the repository to get them)
- only one version can be installed
- one repository per version (remi, remi-php55 and remi-php56)
php54-php-, php55-php- and php56-php* packages are Softwares Collections:
- they can be installed beside the default system version (in /opt/remi)
- various versions can be installed simultaneously
- all the versions are in the remi repository