Except you want to keep the base install without modifying your upstream compatibility, you can try the REMI repository. Make sure you have the yum-priority plugin and you have read the "3rd party repository" section in the Centos Wiki Page.

On Wed, Jun 17, 2009 at 10:47 AM, Tom Brown <tom@ng23.net> wrote:

>
> ever thought of yum search php-mcrypt?
>
>

clearly not
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