Downgrade PHP 5.3 to 5.2 CentOS

# yum --allow-downgrade install php-5.2*
Loaded plugins: allowdowngrade, fastestmirror
Loading mirror speeds from cached hostfile
* addons: centosh3.centos.org
* atomic: www6.atomicorp.com
* base: centosg3.centos.org
* epel: mirror.andreas-mueller.com
* extras: centosf4.centos.org
* updates: centosg3.centos.org
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php.i386 0:5.2.13-1.el5.art set to be updated
--> Processing Dependency: php-cli = 5.2.13-1.el5.art for package: php
--> Processing Dependency: php-common = 5.2.13-1.el5.art for package: php
--> Finished Dependency Resolution
php-5.2.13-1.el5.art.i386 from atomic has depsolving problems
--> Missing Dependency: php-cli = 5.2.13-1.el5.art is needed by package php-5.2.13-1.el5.art.i386 (atomic)
php-5.2.13-1.el5.art.i386 from atomic has depsolving problems
--> Missing Dependency: php-common = 5.2.13-1.el5.art is needed by package php-5.2.13-1.el5.art.i386 (atomic)
Error: Missing Dependency: php-cli = 5.2.13-1.el5.art is needed by package php-5.2.13-1.el5.art.i386 (atomic)
Error: Missing Dependency: php-common = 5.2.13-1.el5.art is needed by package php-5.2.13-1.el5.art.i386 (atomic)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.

# yum list php
Loaded plugins: allowdowngrade, fastestmirror
Loading mirror speeds from cached hostfile
* addons: centosh3.centos.org
* atomic: www6.atomicorp.com
* base: centosg3.centos.org
* epel: mirror.andreas-mueller.com
* extras: centosf4.centos.org
* updates: centosg4.centos.org
Installed Packages
php.i386 5.3.2-2.el5 installed
Available Packages
php.i386 5.1.6-27.el5 base
php.i386 5.2.13-1.el5.art atomic
php.i386 5.3.2-2.el5