Update PHP to 7.4

NOTE: Replace version number to update into any PHP version.

1. Add repository if not already added

sudo add-apt-repository ppa:ondrej/php # Press enter to confirm.
sudo apt-get update

2. Install PHP 7.4

sudo apt install php7.4 php7.4-common php7.4-cli # Replace 7.4 with the version you are installing.

2.1. Install extensions

if you want to see what extensions that has already been installed.

dpkg -l | grep php | tee packages.txt

Install extensions from the new version.

sudo apt install php7.4-curl php7.4-json php7.4-gd php7.4-mbstring php7.4-mysql php7.4-intl php7.4-bcmath php7.4-bz2 php7.4-readline php7.4-zip # Change 7.4 with the version you are installing.

3. Bind with Apache

Check how it's bound to Apache2

apachectl -V

If it's mod_event,

sudo apt install php7.4-fpm

If it's prefork, which is commonly the case.

sudo apt install libapache2-mod-php7.4
sudo a2enmod php7.4

4. Uninstall old versions

sudo apt purge php7.3 libapache2-mod-php7.3 # Replace 7.3 with the version you had.

5. Check installation

php -v