Uninstall MySql using following commands.

sudo apt-get remove –purge mysql*

sudo apt-get purge msql*

sudo apt-get autoremove

sudo apt-get autoclean

sudo apt-get dist-upgrade

sudo apt-get remove dbconfig-mysql

Sudo apt-get dist-upgrade

Uninstall php using following commands.

sudo apt-get remove –purge php*

sudo apt-get purge php*

sudo apt-get autoremove

sudo apt-get autoclean

sudo apt-get remove dbconfig-php

sudo apt-get dist-upgrade