CentOS 5.x system yum upgrade php to 5.2.x method (available for testing)

# rpm --import http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka

# vi /etc/yum.repos.d/CentOS- Base.repo adds the following information

[utterramblings]
name=Jason's Utter Ramblings Repo
baseurl=http://www.jasonlitka.com/media/EL$releasever/$basearch/
enabled=1
gpgcheck=1
gpgkey=http ://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka

Execute the command to upgrade automatically.

yum update php -y
yum install libmcrypt -y

It has been verified that it is OK.

When encountering an error, you can consider the following solutions.

Method 1: Change the URL

rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt

Method 2: First download from the network to your local computer and then install it

wget http://apt.sw.be/RPM-GPG-KEY.dag.txt
rpm --import RPM-GPG-KEY.dag.txt

the above two All methods are available after testing.