PHP Mcrypt on CentOS 6
Yay, CentOS 6 still doesn’t by default include mcrypt in it’s distribution on repositories.
There is hope, EPEL to the rescue again:
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You should see EPEL listed as the repos, then:
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yum install php-mcrypt | 
Also a few of you have mentioned you need to restart Apache. To do this:
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service httpd restart | 
Done.
If you want to do the same for CentOS 7 then simply use this instead:
**Please note the above download is for CentOS 6 x86_64**
UPDATE 12/02/2013: Updated to Latest Link for EPEL 6.8
UPDATE 05/01/2015: Added the link for CentOS 7/EPEL 7.5