yum remove php*
yum install php53

普通に上記でphp53をインストールしたら、下記のようなエラーで悩まされる。

yum-plugin-replaceをインストールしてあげると上手くいきます。

# yum install php-pecl-memcache
・
・
・
php53-common-5.3.3-1.el5_6.1.x86_64 from updates 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.

yum remove php53*
yum intall php-devel

# wget http://ftp-srv2.kddilabs.jp/Linux/distributions/fedora/epel/5/x86_64/epel-release-5-4.noarch.rpm
# rpm -ivh epel-release-5-4.noarch.rpm

# vi /etc/yum.repos.d/epel.repo
6 enabled=1
　↓
6 enabled=0

# wget http://ftp-srv2.kddilabs.jp/Linux/distributions/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm

# yum --enablerepo=epel install yum-plugin-replace

# wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/ius-release-1.0-11.ius.el5.noarch.rpm
# rpm -ivh ius-release-1.0-11.ius.el5.noarch.rpm

# vi /etc/yum.repos.d/epel.repo
6 enabled=1
　↓
6 enabled=0

# yum --enablerepo=ius replace php --replace-with php53u

# yum --enablerepo=ius install php53u-pecl-memcache