Welcome to the CentOS fora. Reading FAQ & Readme First is recommended for new users.
I'd try the version from [epel-testing] repo first. Remi is more likely to replace a lot of core packages.
# yum --enablerepo epel list phpmyadmin\*
Loaded plugins: priorities, protect-packages, refresh-packagekit
70 packages excluded due to repository priority protections
phpMyAdmin.noarch 18.104.22.168-1.el6 epel
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