[root@etc]# yum install php53
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 * rpmforge: ftp-stud.fht-esslingen.de
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php53.x86_64 0:5.3.3-1.el5_6.1 set to be updated
--> Processing Dependency: php53-cli = 5.3.3-1.el5_6.1 for package: php53
--> Processing Dependency: php53-common = 5.3.3-1.el5_6.1 for package: php53
--> Running transaction check
---> Package php53-cli.x86_64 0:5.3.3-1.el5_6.1 set to be updated
---> Package php53-common.x86_64 0:5.3.3-1.el5_6.1 set to be updated
--> Processing Conflict: php53-common conflicts php-common
--> Restarting Dependency Resolution with new changes.
--> Running transaction check
--> Processing Dependency: php-common = 5.1.6-27.el5 for package: php-xml
--> Processing Dependency: php-common = 5.1.6-27.el5 for package: php-pdo
--> Processing Dependency: php-common = 5.1.6-27.el5 for package: php-gd
--> Processing Dependency: php-common = 5.1.6-27.el5 for package: php-cli
--> Processing Dependency: php-common = 5.1.6-27.el5 for package: php-mbstring
--> Processing Dependency: php-common = 5.1.6-27.el5 for package: php
--> Processing Dependency: php-common = 5.1.6-27.el5 for package: php-mysql
--> Processing Dependency: php-common = 5.1.6-27.el5 for package: php-imap
---> Package php-common.x86_64 0:5.1.6-27.el5_5.3 set to be updated
--> Running transaction check
---> Package php.x86_64 0:5.1.6-27.el5_5.3 set to be updated
---> Package php-cli.x86_64 0:5.1.6-27.el5_5.3 set to be updated
---> Package php-gd.x86_64 0:5.1.6-27.el5_5.3 set to be updated
---> Package php-imap.x86_64 0:5.1.6-27.el5_5.3 set to be updated
---> Package php-mbstring.x86_64 0:5.1.6-27.el5_5.3 set to be updated
---> Package php-mysql.x86_64 0:5.1.6-27.el5_5.3 set to be updated
---> Package php-pdo.x86_64 0:5.1.6-27.el5_5.3 set to be updated
---> Package php-xml.x86_64 0:5.1.6-27.el5_5.3 set to be updated
--> Processing Conflict: php53-common conflicts php-common
--> Finished Dependency Resolution
php53-common-5.3.3-1.el5_6.1.x86_64 from base has depsolving problems
  --> php53-common conflicts with php-common
Error: php53-common conflicts with php-common
 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.
[root@s15745022 etc]#