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Install PHP 7.1 on Debian 11

This version of PHP is actively supported.

Good news! PHP 7.1 is being actively supported through 20 Sep 2024. After that point, it's advisable to upgrade to the latest version, since the PHP team will only offer security-related support until 20 Sep 2024, at which point PHP 7.1 will be considered "end-of-life".

Installing PHP 7.1 on Debian 11

Prerequisites

Root access to your Debian 11 system
A stable internet connection
Basic knowledge of command-line operations

Installation

Update your system packages:
```
sudo apt update && sudo apt upgrade -y
```

Add the Sury PHP repository:

sudo apt -y install lsb-release apt-transport-https ca-certificates 
wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php.list

Update package list again:
```
sudo apt update
```

Install PHP 7.1 and common extensions:

sudo apt install php7.1 php7.1-cli php7.1-common php7.1-json php7.1-opcache php7.1-mysql php7.1-zip php7.1-fpm php7.1-mbstring

Verification

Check PHP version:
```
php -v
```
You should see output indicating PHP 7.1.x is installed.
Verify PHP configuration:
```
php -i
```
This will display detailed PHP configuration information.
Check installed PHP modules:
```
php -m
```
This will list all installed PHP modules.