http://php.net/eol.php says that PHP 5.5 and 5.4 are EOL, but a freshly installed Centos 7 box, then fully upgraded, gives me PHP 5.4.16-42.el7. What do people do about maintaining current versions of software on a variety of machines?
If you need more up to date versions of PHP then these can be installed using the Redhat maintained Software Collections repository.
https://www.softwarecollections.org/en/
I've been using this system for up to date Python, PHP and Node versions for a good while and have found it reliable.