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h1. Install PHP8 on Debian 10  Debian 11

Based on "linuxshelltips":https://www.linuxshelltips.com/install-php-8-debian/ but using key only for sury library.

Current best practice is not to install keys for extra repositories as general apt keys but storing them in /usr/share/keyring and authorizing repositories explicitly with the corresponding key.

Also there's no need to uninstall PHP 7. several PHP versions can coexist.

So, let's start.

Have your Debian up to date:

<pre><code class="shell">

sudo apt update && sudo apt upgrade -y

</code></pre>

Next, install the required PHP 8 installation dependencies and also configure the UFT-8 Unicode standard.

<pre><code class="shell">

sudo apt install -y lsb-release ca-certificates apt-transport-https software-properties-common gnupg2   

sudo locale-gen en_US.UTF-8

</code></pre>

Get and store Sury's keys:

<pre><code class="shell">

wget -qO - https://packages.sury.org/php/apt.gpg|gpg --dearmor | sudo tee /usr/share/keyrings/sury-php.gpg > /dev/null

</code></pre>

Config Sury's repository:

<pre><code class="shell">

echo "deb [signed-by=/usr/share/keyrings/sury-php.gpg] https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/sury-php.list

</code></pre>

Use the newly installed repository (most times it also upgrades the currently installed PHP 7.4):

<pre><code class="shell">

sudo apt update && sudo apt upgrade -y

</code></pre>

If the meta packege _php_ is installed, this upgrade switches to the most current PHP version (i.e 8.2 in February 2023)

Now you can install any supported PHP version:

<pre><code class="shell">

sudo apt install php8.1

</code></pre>

To install other PHP extensions, reference the syntax:

<pre><code class="shell">

sudo apt install php8.1-name_of_extension

</code></pre>

For instance, to install a php-fpm extension, we will execute the command:

<pre><code class="shell">

sudo apt install php8.1-fpm 

</code></pre>