This is a Fedora 17 feature.

Use  YUM to install :

yum --enablerepo=remi,remi-test update php-\*

This packages are also on the road to Fedora 17.

There are also 34 pecl extension packages available for this new version.

Documentation: Migration from PHP 5.3.x to PHP 5.4.x.

For all questions or help, please use the Forums.

I plan to keep them, for a few time, in remi-test repository for  Enterprise Linux.