:: How to install php-fpm on CentOS 5.8
+ installing repository

rpm -Uvh //rpms.famillecollet.com/enterprise/remi-release-5.rpm
yum install yum-priorities

+ add priority=10 on remi.repo

vi /etc/yum.repos.d/remi.repo
[remi]
name=Les RPM de remi pour Enterprise Linux $releasever - $basearch
#baseurl=//rpms.famillecollet.com/enterprise/$releasever/remi/$basearch/
mirrorlist=//rpms.famillecollet.com/enterprise/$releasever/remi/mirror
enabled=0
priority=10
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
failovermethod=priority

+ installing php-fpm

yum install php-fpm

or

yum --enablerepo=remi install php-fpm

 
:: Links
+ Google
+ HowToForge