Quickly change your PHP version on Ubuntu

sphp.sh

#!/bin/bash

if [ $# -ne 1 ]; then
	echo "params: [version] (8.0, 5.6, 7.4 ...)"
	exit 1
fi

COMMAND_EXISTS=`which php$1`
if [ $? -eq 0 ]; then
	# editing nginx vhosts
	NGINX_EXISTS=`which nginx`
	if [ $? -eq 0 ]; then
		for idx in `ls /etc/nginx/sites-available`; do
			echo "editing file /etc/nginx/sites-available/$idx ..."
			sudo sed -i -e "s/[0-9]\.[0-9]-fpm/$1-fpm/g" /etc/nginx/sites-available/$idx
		done
		sudo systemctl restart nginx
		echo "updated nginx"
	fi
	# editing apache2
	APACHE_EXISTS=`which apache2`
	if [ $? -eq 0 ]; then
		cd /etc/apache2/mods-enabled
		APACHE_PHP_MODULE=`ls php*.conf | cut -f1,2 -d.`
		cd - >/dev/null
		if [ "$APACHE_PHP_MODULE" != "" ]; then
			sudo a2dismod $APACHE_PHP_MODULE >/dev/null
		fi
		sudo a2enmod php$1 >/dev/null
		if [ $? -ne 0 ]; then
			echo "Failed to update the PHP version for Apache2!"
			exit 1
		fi
		sudo systemctl restart apache2
		echo "updated apache2"
	fi
	# editing cli
	sudo update-alternatives --set php $COMMAND_EXISTS
	echo "updated cli"
	php -v
else
	echo "php version does not seem to be installed :("
	exit 1
fi