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Install PHP 8.1 on Debian 11

Warning! This version of PHP is outdated.

PHP 8.1 reached end of active support on 25 Nov 2023. As of today, PHP 8.1 is only receiving security related updates through 31 Dec 2025, at which point it will be considered end-of-life and receive no further updates. It's strongly recommended to upgrade to the latest version of PHP before then.

Installing PHP 8.1 on Debian 11

Prerequisites

Debian 11 (Bullseye) installed and updated
Root access or a user with sudo privileges
Terminal access

Installation

Add the Sury PHP repository:

sudo apt update
sudo apt install -y lsb-release ca-certificates apt-transport-https software-properties-common
sudo 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 the package list:
```
sudo apt update
```

Install PHP 8.1 and common extensions:

sudo apt install -y php8.1 php8.1-cli php8.1-common php8.1-curl php8.1-mbstring php8.1-mysql php8.1-xml

Verification

Check the installed PHP version:
```
php -v
```
Verify PHP configuration:
```
php -i
```
Check installed PHP modules:
```
php -m
```