How to set php 8.0 as default version in ubuntu server

user_9868662 0
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For some reason, i have to install PHP 7.4 and PHP 8.0 in the same ubuntu server. By default when i install php 7.4, it shows it is the default version when use the command php -v.

But i want to run composer using PHP 8.0 now to install one of my application in the server. Server cant find any php version now, so i cant install my application using composer.

How did i install PHP 8.0

I have used sudo add-apt-repository ppa:ondrej/php this repository to install latest version of 8.0 in the server, I can make it work with caddy server and even site is running fine in my testing environment. https://caddyt.tamilchatz.com << you can check out this URL to make sure my 8.0 is running fine in server.

Anyway i have removed PHP 7.4 from server to make sure does it help me to set 8.0 as default one, but no i can't get it to work.

php --version

enter image description here

Help me out to set PHP 8.0 as default version in server now. Thanks.

ubuntu linux php
2 Answers

To update CLI version:

sudo update-alternatives --config php

should work for all ubuntu versions after 16.04 (18.04 and 20.04)

This is what you should see as a response:

There are 4 choices for the alternative php (providing /usr/bin/php).

  Selection    Path             Priority   Status
------------------------------------------------------------
* 0            /usr/bin/php7.2   72        auto mode
  1            /usr/bin/php5.6   56        manual mode
  2            /usr/bin/php7.0   70        manual mode
  3            /usr/bin/php7.1   71        manual mode
  4            /usr/bin/php7.2   72        manual mode

Press to keep the current choice[*], or type selection number and press enter to change version:

To Update version in server/browser output (you can use for all version just change version number as per requirement):

DOWNGRADE PHP 8.0 to PHP 7.4

sudo a2dismod php8.0 sudo a2enmod php7.4 sudo service apache2 restart sudo update-alternatives --config php sudo update-alternatives --config phar sudo update-alternatives --config phar.phar sudo service apache2 restart

UPGRADE PHP 7.4 to PHP 8.0

sudo a2dismod php7.4 sudo a2enmod php8.0 sudo service apache2 restart sudo update-alternatives --config php sudo update-alternatives --config phar sudo update-alternatives --config phar.phar sudo service apache2 restart

user_96619480

Try this:

sudo update-alternatives --set php /usr/bin/php7.4
user_132766800
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