phpmyadmin prompt mcrypt extension is missing, check the phpconfiguration

phpmyadmin prompt mcrypt extension is missing, check the php configuration, in the Google search found that this command can be solved
yum install php-mcrypt libmcrypt libmcrypt-devel
discovered after I entered this three packages are not found
no package php-mcrypt available.
no package libmcrypt available.
no package libmcrypt-devel available.

tried to manually install on the network, the result is still a lot of problems if the installation was successful indeed, I'm not sure.
but still prompted to open phpmyadmin mcrypt extension is missing, check the php configuration
Why not humane point ah, installed software so so very tedious ah ~ what is the solution? Please expert help, thank you. ~
------ Solution --------------------------------------- -----
package Yes ah, another 163 sources try
------ For reference only -------------------- -------------------

ask how to do? I was first learning to use linux, I chose centos, how to do to modify the source into a 163? It would be great if you can somehow.
------ For reference only -------------------------------------- -

ask how to do? I was first learning to use linux, I chose centos, how to do to modify the source into a 163? It would be great if you can somehow.  

reference to this:
http://tel.mirrors.163.com/.help/centos.html
------ For reference only ---------------- -----------------------

ask how to do? I was first learning to use linux, I chose centos, how to do to modify the source into a 163? It would be great if you can somehow.    

  

  
reference to this:   
http://tel.mirrors.163.com/.help/centos.html  

, although not able to solve the problem, if there is no source 163 which several extensions Oh, but now I solved the problem, or to thank you. Points to you friends / ~