upgrade_php.sh

#!/bin/bash

if [ ! -x "$(command -v php)" ]; then
    echo "PHP is not installed. Aborting."
    exit 1
fi

phpnewversion=7.4
phpoldversion=7.3
echo "PHP current: $phpoldversion"
echo "PHP target : $phpnewversion"
echo "Do you want to upgrade PHP now? [Y|N]"
    read upgradeconfirmation
if [ "$upgradeconfirmation" = "Y" ] || [ "$upgradeconfirmation" = "y" ]; then
    echo "Process: Upgrading PHP to $phpnewversion"
    echo ""
    cd /tmp
    dpkg-query --showformat='${Package}\t\n' --show | grep php$phpoldversion > /tmp/phpoldpackages.txt
    cp -a /tmp/phpoldpackages.txt /tmp/phpnewpackages.txt
    sed -i "s|$phpoldversion|$phpnewversion|g" /tmp/phpnewpackages.txt
    apt-get update > /dev/null 2>&1
    apt-get install $(cat /tmp/phpnewpackages.txt)
    update-rc.d php$phpnewversion-fpm defaults
    mv /etc/php/$phpoldversion/cli/php.ini /etc/php/$phpnewversion/cli/php.ini
    mv /etc/php/$phpoldversion/fpm/php.ini /etc/php/$phpnewversion/fpm/php.ini
    sed -i "s|$phpoldversion|$phpnewversion|g" /etc/php/$phpoldversion/fpm/php-fpm.conf
    mv /etc/php/$phpoldversion/fpm/php-fpm.conf /etc/php/$phpnewversion/fpm/php-fpm.conf
    rm -rf /etc/php/$phpnewversion/fpm/pool.d
    mkdir -p /etc/php/$phpnewversion/fpm/pool.d
    mv /etc/php/$phpoldversion/fpm/pool.d/* /etc/php/$phpnewversion/fpm/pool.d
    mv /etc/logrotate.d/php$phpoldversion-fpm /etc/logrotate.d/php$phpnewversion-fpm
    sed -i "s|$phpoldversion|$phpnewversion|g" /etc/logrotate.d/php$phpnewversion-fpm
    rm -rf /etc/logrotate.d/php$phpnewversion-fpm.dpkg-dist
    systemctl stop php$phpoldversion-php
    apt-get purge $(cat /tmp/phpoldpackages.txt)
    apt-get -y purge php-imagick
    apt-get -y install php$phpnewversion-imagick
    systemctl restart php$phpnewversion-fpm
    rm -rf /etc/php/$phpoldversion
    rm -rf /var/lib/php/modules/$phpoldversion
    rm -rf /tmp/phpoldpackages.txt
    rm -rf /tmp/phpnewpackages.txt
    if [ -d /var/cache/nginx/micro ]; then
        rm -rf /var/cache/nginx/micro/*
    fi
    systemctl reload nginx
    echo ""
    echo "PHP has been upgraded succcesfully to version $phpnewversion"
else
    echo "Process: Aborted"
    exit 0
fi