If a downgrade to PHP 5.2 is needed do the following:

1. The repositories for Centos 6 do not include old packages (another reason to stick with 5.6) so we need to pull all packages needed.
Therefore we access the server, create a folder there (mkdir php) and then enter that folder (cd php)

2. Once inside we need to download all packages needed; One trusted source is this: http://www6.atomicorp.com/channels/atomic/centos/6/x86_64/RPMS/
Once you have opened that on your browser, search for all php- .rpm files that are for your Centos version, there is 32 and 32+64 bits, to know the correct one do a uname –a at the server, if you see it says x86_64 then make sure that all .rpm files you download have that on their names, then

wget them to the server:
Wget http://www6.atomicorp.com/…/RPMS/php-5.2.x.x.x.x.rpm
Once you have downloaded all files that begin with php- proceed to install the following files:
Yum install Automake autoconf libt1*
**make sure to add that ^ asterisk too

3. Once completed then type: rpm –oldpackage -Uvh php*

4. When done, type php –v to check the version, it should say 5.2 – Done