Why No package php-mysql available?

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http://serverfault.com – After downgrade from php 5.3 to 5.2 on CentOS 5, I can't find the usuel packages on the standard enabled repos. Missing php, mysql… The I force the install with rpm-ivh on Jason repo for most of the packages. I can't install php-mysql package with this method. Why yum install php-mysql gives: No package php-mysql available. Nothing to do. (HowTos)