Here are updated packages in the Yum repository:

• PHP 5.6.0alpha1 for RHEL/CentOS 6
• PHP 5.5.9 for RHEL/CentOS 5/6 changelog
• Apcu 4.0.3 for PHP 5.5.9 on RHEL/CentOS 5/6
• PHP 5.4.25 for RHEL/CentOS 5/6 changelog
• Apcu 4.0.3 for PHP 5.4.25 on RHEL/CentOS 5/6
• Zend OpCache 7.0.3 for PHP 5.4.25 on RHEL/CentOS 5/6
  

The PHP 5.6.0alpha1 release will stay in el6-testing until it's release date, so it's clear it's not suitable for production use yet.

The other PHP releases are bug-fix releases only, no known security issue fixes included.