To keep up with the latest versions of PHP and MySQL, CentOS 5 based Linux systems need to install the EPEL and Remi Repositories to get MySQL 5.5 installed to CentOS 5.
Commands are (as root):
yum install php53-mysql
wget http://rpms.famillecollet.com/enterprise/remi-release-5.rpm
wget http://download.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
rpm -iv epel-release-5-4.noarch.rpm
rpm -iv remi-release-5.rpm
yum upgrade mysql-server
The last will upgrade any installed version of MySQL server and clients software on your Linux system.
The first yum install command will bring in the PHP 5.3 and its mysql module and dependencies, which then get upgraded after the last yum upgrade is run.
FYI,
Richard.
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