How to Update PHP Version in a LAMP Stack

This article covers:

1. Update PHP in a Lamp Stack
2. Switch PHP version

Audiences of this article:

• Server Admin

Install The Latest PHP (7.4 in this case)

sudo apt-get install software-properties-common 
sudo add-apt-repository ppa:ondrej/php 
sudo apt-get update 
sudo apt-get install -y php7.4
sudo apt install php7.4-common php7.4-mysql php7.4-xml php7.4-xmlrpc php7.4-curl php7.4-gd php7.4-imagick php7.4-cli php7.4-dev php7.4-imap php7.4-mbstring php7.4-opcache php7.4-soap php7.4-zip php7.4-intl -y

Disable old PHP version 7.1 and Enable New version 7.4, then restart Apache and check PHP version

sudo a2dismod php7.0 
sudo a2enmod php7.4
sudo service apache2 restart
php -v

If your PHP version does NOT change, it’s likely you have switched PHP version earlier, you’ll need to switch PHP version manually like so:

sudo update-alternatives --set php /usr/bin/php7.4