Solution: Mysql is not working in MAC OS Yosemite

Edit the below file, with this command on Terminal.app:

sudo vim /Applications/XAMPP/xamppfiles/mysql/scripts/ctl.sh

On line #59, delete this:

/Applications/XAMPP/xamppfiles/xampp startmysql > /dev/null &

and put this

/Applications/XAMPP/xamppfiles/bin/mysql.server start > /dev/null &

(save the file: ESC :wq!)
Restart All Servers on XAMPP.app (manager-osx)