rootdebian:~$ apt install -y lsb-release apt-transport-https ca-certificates wget

rootdebian:~$ wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg

rootdebian:~$ echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php.list

rootdebian:~$ apt update

rootdebian:~$ apt install php8.1 -y

rootdebian:~$ apt install php8.1-cli php8.1-xml php8.1-gd php8.1-curl php8.1-mysql php8.1-ldap php8.1-zip -y

rootdebian:~$ php -v

rootdebian:~$ vim /var/www/html/phpinfo.php

<?php

phpinfo();

?>