After upgrading my little cloud server, my webpage won't start and phpmyadmin won't start

After running do-release-upgrade on my little cloud server, my webpage won't work and phpadmin will not start. Upgrade was from 20.04 Server to 22.04 Server. The upgrade ended successfully. I can ssh into the server

When I enter my webpage address, I see the contents of the index.php, but that's all.

<?php
 // don't forget the / before the file name!! VIP VIP VIP DO NOT FORGET THE /  ï¼ï¼
//include $_SERVER['DOCUMENT_ROOT'] . '/startfile.html.php';
header('location: startfile.html.php')
?>

but I don't get my startfile.html.php. Everything worked fine before the upgrade!

Also, I can't access phpmyadmin, I just see this in stead of the login page:

<?php

declare(strict_types=1);

use PhpMyAdmin\Routing;

if (! defined('ROOT_PATH')) {
    // phpcs:disable PSR1.Files.SideEffects
    define('ROOT_PATH', __DIR__ . DIRECTORY_SEPARATOR);
    // phpcs:enable
}

global $route, $containerBuilder;

require_once ROOT_PATH . 'libraries/common.inc.php';

$dispatcher = Routing::getDispatcher();
Routing::callControllerForRoute($route, $dispatcher, $containerBuilder);

I can access the server via ssh.

There is an error in the apache2 mydomain.error.log which says it cannot stat mydomain/public_html/wp-login.php

I have no idea why it is looking for wp-login.php I never had such a file.

Why won't my index.php open my startfile.html.php?

I can access mysql from the command line as a normal, non-root user.

Half the problem solved:

In /etc/apache2/mods-enabled both php7.4 and php8.1 had entries:

php7.4.load and php7.4.conf php8.1.load and php8.1.conf

php7.4 is not installed. But I think apache2 was trying to load the php7.4 modules

I renamed them php7.4.load.old and php7.4.conf.old

Now I can open phpmyadmin in my browser, so half the problem solved.

Still trying to figure out why PHP is not working as far as the webpages are concerned!

Now the webpage is working: I put this in /etc/apache2/apache2.conf

<Directory /var/www/*>
        Options Indexes FollowSymLinks
        AllowOverride None
        Require all granted
</Directory>

Before I only had this below, which is from William Desportes, recommended to me here, but it restricted the opening of files in /var/www/

<Directory />
        Options SymLinksIfOwnerMatch
        DirectoryIndex index.php
        #AllowOverride None
        #Require all denied
        # limit libapache2-mod-php to files and directories necessary by pma
        # PHP 8+
        <IfModule mod_php.c>
                php_admin_value upload_tmp_dir /var/lib/phpmyadmin/tmp
                php_admin_value open_basedir /var/www/:/usr/share/phpmyadmin/:/usr/share/doc/phpmyadmin/:/etc/phpmyadmin/:/var/lib/phpmyadmin/:/usr/share/php/:/usr/share/javascript/
        </IfModule>
</Directory>

The error in /var/log/apache2/mydomain.com-error.log was:

[Thu Jul 13 08:39:27.883981 2023] [php:warn] [pid 6793] [client 35.167.198.156:55492] PHP Warning: Unknown: open_basedir restriction in effect. File(/var/www/mydomain.com/public_html/index.php) is not within the allowed path(s): (/usr/share/phpmyadmin/:/usr/share/doc/phpmyadmin/:/etc/phpmyadmin/:/var/lib/phpmyadmin/:/usr/share/php/:/usr/share/javascript/) in Unknown on line 0

All seems to be working now!