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Firstly, to be able to install a certain PHP version, in this case, 7.2 you’ll need to add a certain repository to your system

 sudo apt-get install software-properties-common python-software-properties;
sudo apt-add-repository ppa:ondrej/php
sudo add-apt-repository ppa:jczaplicki/xenial-php74-temp
sudo apt-get update

Update the repository index.

sudo apt update

Install PHP 7.4 with the below command.

sudo apt install -y php7.4 php7.4-cli php7.4-common php7.4-fpm

To install extensions run

sudo apt install -y php7.4-mysql php7.4-dom php7.4-simplexml php7.4-ssh2 php7.4-xml php7.4-xmlreader php7.4-curl  php7.4-exif  php7.4-ftp php7.4-gd  php7.4-iconv php7.4-imagick php7.4-json  php7.4-mbstring php7.4-posix php7.4-sockets php7.4-tokenizer

The above are the required extensions for your WordPRess installation. Having said that it’s good to have these extensions as well.

sudo apt install -y php7.4-mysqli php7.4-pdo  php7.4-sqlite3 php7.4-ctype php7.4-fileinfo php7.4-zip php7.4-exif

That’s it, you now have your PHP version installed.