Very Good article on Setting up LAMP Stack on El Capitan:
On OS X Yosemite/El Capitan to start/stop/restart MySQL post 5.7 from the command line:
sudo launchctl load -F /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist
sudo launchctl unload -F /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist