phpMyAdmin missing mysqli and mycrpt

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http://serverfault.com – I have a centos 6.2 box loaded the phpMyAdmin then I get missing mysqli then I yum install php-mysqli then I got to /etc/php.ini and put localhost under mysqli option for the host. So did I do the steps correctly? Now it gives my mcrpyt is missing? So what must I do please help ? I have tried yum install php-mcrypt but nothings to install is the message. (HowTos)