[root@ns1 modules]# yum clean all
Loading "installonlyn" plugin
Cleaning up Everything

[root@ns1 modules]# yum install mod_php
Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
base                      100% |=========================| 1.1 kB    00:00
updates                   100% |=========================|  951 B    00:00
addons                                                           951 B 00:00
extras                    100% |=========================| 1.1 kB    00:00
Reading repository metadata in from local files
primary.xml.gz            100% |=========================| 798 kB    00:00
base      : ################################################## 2334/2334
Added 2334 new packages, deleted 0 old in 21.83 seconds
primary.xml.gz            100% |=========================| 315 kB    00:00
updates   : ################################################## 723/723
Added 723 new packages, deleted 0 old in 8.48 seconds
primary.xml.gz                                                   157 B 00:00
Added 0 new packages, deleted 0 old in 0.00 seconds
primary.xml.gz            100% |=========================|  66 kB    00:00
extras    : ################################################## 251/251
Added 251 new packages, deleted 0 old in 1.88 seconds
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for php to pack into transaction set.
php-5.1.6-5.el5.i386.rpm  100% |=========================|  17 kB    00:00
---> Package php.i386 0:5.1.6-5.el5 set to be updated
--> Running transaction check
--> Processing Dependency: libcurl.so.3 for package: php
--> Processing Dependency: php-common = 5.1.6-5.el5 for package: php
--> Processing Dependency: php-cli = 5.1.6-5.el5 for package: php
--> Processing Dependency: libaspell.so.15 for package: php
--> Processing Dependency: libgmp.so.3 for package: php
--> Processing Dependency: libpspell.so.15 for package: php
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for gmp to pack into transaction set.
gmp-4.1.4-10.el5.i386.rpm 100% |=========================|  10 kB    00:00
---> Package gmp.i386 0:4.1.4-10.el5 set to be updated
---> Downloading header for curl to pack into transaction set.
curl-7.15.5-2.el5.i386.rp 100% |=========================|  11 kB    00:00
---> Package curl.i386 0:7.15.5-2.el5 set to be updated
---> Downloading header for php-cli to pack into transaction set.
php-cli-5.1.6-5.el5.i386. 100% |=========================|  16 kB    00:00
---> Package php-cli.i386 0:5.1.6-5.el5 set to be updated
---> Downloading header for aspell to pack into transaction set.
aspell-0.60.3-7.1.i386.rp 100% |=========================|  26 kB    00:00
---> Package aspell.i386 12:0.60.3-7.1 set to be updated
--> Running transaction check
--> Processing Dependency: aspell-en for package: aspell
--> Processing Dependency: php-common = 5.1.6-5.el5 for package: php
--> Processing Dependency: php-common = 5.1.6-5.el5 for package: php-cli
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for aspell-en to pack into transaction set.
aspell-en-6.0-2.1.i386.rp 100% |=========================| 9.1 kB    00:00
---> Package aspell-en.i386 50:6.0-2.1 set to be updated
--> Running transaction check
--> Processing Dependency: php-common = 5.1.6-5.el5 for package: php
--> Processing Dependency: php-common = 5.1.6-5.el5 for package: php-cli
--> Finished Dependency Resolution
Error: Missing Dependency: php-common = 5.1.6-5.el5 is needed by package php
Error: Missing Dependency: php-common = 5.1.6-5.el5 is needed by package php-cli