A simple script that helps you choose which PHP version should be active - apache version

phpswitch.sh

#!/bin/bash

color_off='\033[0m' # Text Reset
color_green='\033[1;32m'  # Green text

versions=(/usr/bin/php*)
mapfile -t versions < <(printf '%s\n' "${versions[@]}" | egrep '[0-9]+\.[0-9]+' | cut -c 13-)

counter=0
if [ $# -eq 0 ]; then
   current=$(php -v | grep --only-matching --perl-regexp "(PHP )\d+\.\\d+\.\\d+")
   current=${current:4:3}

   echo ""
   echo 'Installed PHP versions:'

   for i in "${versions[@]}"; do
      if [ "$current" == "$i" ]; then
         echo -e "$(($counter + 1)))  PHP $i ${color_green}<- current${color_off}"
      else
         echo "$(($counter + 1)))  PHP $i"
      fi

      counter=$(($counter + 1))
   done

   echo ""
   echo 'Which version would you like to activate?'
   read selected
   chosen="${versions[$selected - 1]}"
else
   echo ""
   echo 'Installed PHP versions:'

   for i in "${versions[@]}"; do
      if [ $1 == $i ]; then
         echo -e "$(($counter + 1)))  PHP $i ${color_green}<- activating...${color_off}"
         chosen="${versions[$counter]}"
      else
         echo "$(($counter + 1)))  PHP $i"
      fi

      counter=$(($counter + 1))
   done
fi

if [ -z "$chosen" ]; then
   echo "The selected PHP version is not installed!"
   exit 1
fi

for i in "${versions[@]}"; do
   sudo a2dismod php$i &>/dev/null
done

echo ""
echo -e "${color_green}Activating PHP $chosen...${color_off}"
echo ""
sudo a2enmod php$chosen
sudo service apache2 restart
sudo ln -sfn /usr/bin/php$chosen /etc/alternatives/php

echo ""
echo -e "${color_green}PHP $chosen is now active!${color_off}"

This is what it looks like:

The script can now run with a parameter (eg. $ phpswitch 7.4) or without parameters (eg. $ phpswitch)