Install PHP 5.6 , PHP 7 and PHP 7.2 in ubuntu

Install PHP 5.6 and PHP 7 and PHP 7.3 both in ubuntu

sudo a2dismod proxy_fcgi proxy; sudo service apache2 restart
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get install php7.0 php5.6 php5.6-mysql php-gettext php5.6-mbstring php-mbstring php7.0-mbstring php-xdebug libapache2-mod-php5.6 libapache2-mod-php7.0

2. Switch PHP version:

From php5.6 to php7.0:

Apache:
sudo a2dismod php5.6 ; sudo a2enmod php7.0 ; sudo service apache2 restart

CLI:
sudo update-alternatives –set php /usr/bin/php7.0

From php7.0 to php5.6:
Apache:
sudo a2dismod php7.0 ; sudo a2enmod php5.6 ; sudo service apache2 restart

CLI:
sudo update-alternatives –set php /usr/bin/php5.6

From php7.2 to php5.6:
Apache:
sudo a2dismod php7.2 ; sudo a2enmod php5.6 ; sudo service apache2 restart

CLI:
sudo update-alternatives –set php /usr/bin/php5.6

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