Hi,
MySQL and MariaDB connections are correct.
Try with a newer version of PhpMyAdmin 4.9.5 or 5.0.2
Both versions are available on
http://wampserver.aviatechno.netFirst install version 5.0.2 by answering yes to remove existing versions and then install version 4.9.5 by choosing Add to existing versions.
You will have the choice to launch one or the other from 'http://localhost/'.
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons