change php version ubuntu

change php version ubuntu.txt

Switch php version from x.y to p.q in apache

sudo a2dismod php7.2
sudo a2enmod php5.6
sudo service apache2 restart
----------------------------------------
Switch php cli version
sudo update-alternatives --config php
There are 3 choices for the alternative php (providing /usr/bin/php).

  Selection    Path             Priority   Status
------------------------------------------------------------
  0            /usr/bin/php7.3   73        auto mode
  1            /usr/bin/php5.6   56        manual mode
* 2            /usr/bin/php7.1   71        manual mode
  3            /usr/bin/php7.3   73        manual mode

Press <enter> to keep the current choice[*], or type selection number: 1 
I entered 1 because i wanted to switch to php5.6