phpMyAdmin 403 Forbidden Error after upgrade to Yosemite
Since upgrade to Yosemite updated your Apache, you have to update phpMyAdmin.conf to use new Access control syntax.

Have a look at: http://httpd.apache.org/docs/2.4/upgrading.html

In my case I need changed /etc/apache2/other/phpMyAdmin.conf

Order allow,deny

Allow from all

to

Require all granted

More info here: http://www.zoubi.me/blog/you-dont-have-permission-access-phpmyadmin-server-after-upgrading-yosemite