http://fedoraproject.org/wiki/Features/Php55
This feature is now nearly completed.
Sorry for the delay, upstream have just released beta1 (Feature Freeze), the slip is due to the merge of the new "Zend OPcache" extension, the old "Zend Optimizer+" which have been open sourced (PHP License). APC still present, but only for user data cache.
So please, start the test of your favorite webapp.
As usually backport packages are available in my "remi-test" repository for those who want to use/test/stress PHP 5.5.0 on Fedora 17/18.
Regards, Remi.
P.S. full list of 47 rebuilt packages:
php-5.5.0-0.1.beta1.fc19 graphviz-2.30.1-3.fc19 ice-3.5-0.4.b.fc19 (ice-php) libdigidocpp-0.3.0-18.fc19 (php-digidoc) libkolabxml-0.8.3-2.fc19 (php-kolabformat) libpuzzle-0.11-17.fc19 (php-libpuzzle) maniadrive-1.2-54.fc19 php-facedetect-1.0.1-9.fc19 php-idn-1.2c-8.fc19 php-libvirt-0.4.5-4.fc19 php-magickwand-1.0.9-6.fc19 php-pecl-amqp-1.0.9-4.fc19 php-pecl-apc-3.1.15-0.2.svn329724.fc19 php-pecl-cairo-0.3.2-3.fc19 php-pecl-gearman-1.1.1-1.fc19 php-pecl-geoip-1.0.8-5.fc19 php-pecl-gmagick-1.1.0-0.8.RC2.fc19 php-pecl-http-2.0.0-0.16.beta4.fc19 php-pecl-igbinary-1.1.2-0.5.git3b8ab7e.fc19 php-pecl-imagick-3.1.0-0.6.RC2.fc19 php-pecl-lzf-1.6.2-4.fc19 php-pecl-mailparse-2.1.6-4.fc19 php-pecl-memcache-3.0.7-7.fc19 php-pecl-memcached-2.1.0-7.fc19 php-pecl-mongo-1.3.5-1.fc19 php-pecl-mysqlnd-ms-1.4.2-3.fc19 php-pecl-mysqlnd-qc-1.2.0-2.fc19 php-pecl-ncurses-1.0.2-4.fc19 php-pecl-oauth-1.2.3-3.fc19 php-pecl-parsekit-1.3.0-3.fc19 php-pecl-radius-1.2.5-16.fc19 php-pecl-rrd-1.1.0-3.fc19 php-pecl-runkit-1.0.4-0.3.GIT8c73eaf.fc19 php-pecl-selinux-0.3.1-11.fc19 php-pecl-solr-1.0.2-6.fc19 php-pecl-sphinx-1.2.0-1.fc19 php-pecl-ssh2-0.12-1.fc19 php-pecl-uuid-1.0.3-5.fc19 php-pecl-xdebug-2.2.2-0.1.gitb1ce1e3.fc19 php-pecl-xhprof-0.9.2-10.gitb8c76ac5ab.fc19 php-pecl-yaml-1.1.0-4.fc19 php-redis-2.2.2-7.git6f7087f.fc19 php-shout-0.9.2-14.fc19 php-zmq-0.6.0-10.20120613git516bd6f.fc19 remctl-3.3-4.fc19 uuid-1.6.2-17.fc19 zorba-2.8.0-4.fc19