Prerequisites

• Root access or sudo privileges on your Debian 11 system
• Terminal access
• Internet connection for downloading packages

Installation

1. Update the package list:

   sudo apt update

2. Install the required dependencies:

   sudo apt install -y lsb-release ca-certificates apt-transport-https software-properties-common

3. Add the Sury PHP repository:

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

4. Import the repository GPG key:

   wget -qO - https://packages.sury.org/php/apt.gpg | sudo apt-key add -

5. Update the package list again:

   sudo apt update

6. Install PHP 7.2 and common extensions:

   sudo apt install -y php7.2 php7.2-cli php7.2-common php7.2-curl php7.2-gd php7.2-json php7.2-mbstring php7.2-mysql php7.2-xml

Verification

1. Check the PHP version:

   php -v

   The output should display PHP 7.2.x

2. Verify installed PHP modules:

   php -m

   This will list all installed PHP modules

3. Create a test PHP file:

   echo '<?php phpinfo(); ?>' | sudo tee /var/www/html/phpinfo.php

4. Access the PHP info page in your web browser:

   http://your_server_ip/phpinfo.php

   This will display detailed information about your PHP installation