Small script to display dialog to switch between PHP version.

phpswitch.sh

#!/usr/bin/env bash
#
# Small script to display dialog to switch between PHP verion.
# Tested on Ubuntu 16.04 LTS
#
# Execution:
#   $ sudo ./phpswitch.sh
#
# You can also create a softlink to the /usr/bin directory
#   $ sudo ln -s ~/phpswitcher.sh /usr/bin/phpswitch
#   $ sudo phpswitch

if [ ! -f /usr/bin/dialog ]; then 
   echo "dialog is required please install it with:"
   echo "  sudo apt install -y dialog"
   exit -1
fi

default=`/usr/bin/php -v`
current=${default:4:3}
versions=("5.4" "5.5" "5.6" "7.0" "7.1" "7.2" "7.3")
options=()

for index in ${!versions[@]}; do
   if [ -f /usr/bin/php${versions[$index]} ]; then
      options+=($index)
      options+=(${versions[$index]})
      if [ ${versions[$index]} == $current ]; then
         options+=(on)
      else
         options+=(off)
      fi
   fi
done

selected=$(dialog --backtitle "Available PHP versions:" \
--radiolist "Select version:" 0 0 0 \
"${options[@]}" 2>&1 >/dev/tty)
clear

for version in ${versions[@]}; do
   if [ -f /etc/apache2/mods-available/php${version}.conf ] && [ -f /etc/apache2/mods-available/php${version}.load ]; then  
      a2dismod php${version}
   fi
done

echo "Switching php binary..."
update-alternatives --set php /usr/bin/php${versions[$selected]}
echo "done!"

echo "Switching php Apache2 handler..."
a2enmod php${versions[$selected]}
echo "done!"

echo "Rebooting Apache2"
service apache2 restart
echo "done!"