Bullseye: after php8.3 install, php7.4 still running

[lzbk]

I have a problem analogous to the one described here.

I had php7.4 running well. I installed php8.3 (using the sury repo), I tried to install all the 7.4 counterpart in 8.3 :

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sudo apt list --installed | grep -i php

gives:

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libapache2-mod-php7.4/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64 [installé, pouvant être supprimé automatiquement]
libapache2-mod-php8.3/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php-bz2/oldstable,now 2:7.4+76 all [installé, pouvant être mis à jour vers : 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c]
php-cli/bullseye,now 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c all  [installé, automatique]
php-common/bullseye,now 2:95+0~20240927.54+debian11~1.gbpe0084c all  [installé, automatique]
php-composer-ca-bundle/oldstable,now 1.2.9-1 all  [installé, automatique]
php-composer-semver/oldstable,now 3.2.4-2 all  [installé, automatique]
php-composer-spdx-licenses/oldstable,now 1.5.5-2 all  [installé, automatique]
php-composer-xdebug-handler/oldstable,now 1.4.5-1+deb11u1 all  [installé, automatique]
php-curl/oldstable,now 2:7.4+76 all [installé, pouvant être mis à jour vers : 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c]
php-gd/oldstable,now 2:7.4+76 all [installé, pouvant être mis à jour vers : 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c]
php-google-recaptcha/oldstable,now 1.2.4-3 all  [installé, automatique]
php-intl/oldstable,now 2:7.4+76 all [installé, pouvant être mis à jour vers : 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c]
php-json-schema/oldstable,now 5.2.10-2 all  [installé, automatique]
php-mariadb-mysql-kbs/oldstable,now 1.2.12-1 all  [installé, automatique]
php-mbstring/oldstable,now 2:7.4+76 all [installé, pouvant être mis à jour vers : 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c]
php-mysql/oldstable,now 2:7.4+76 all [installé, pouvant être mis à jour vers : 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c]
php-phpmyadmin-motranslator/oldstable,now 5.2.0-1 all  [installé, automatique]
php-phpmyadmin-shapefile/oldstable,now 2.1-5 all  [installé, automatique]
php-phpmyadmin-sql-parser/oldstable,now 5.4.1-1 all  [installé, automatique]
php-phpseclib/oldstable,now 2.0.30-2+deb11u2 all  [installé, automatique]
php-psr-cache/oldstable,now 1.0.1-2 all  [installé, automatique]
php-psr-container/oldstable,now 1.0.0-2 all  [installé, automatique]
php-psr-log/oldstable,now 1.1.3-2 all  [installé, automatique]
php-react-promise/oldstable,now 2.7.0-2 all  [installé, automatique]
php-symfony-cache-contracts/oldstable,now 1.1.10-2+deb11u1 all  [installé, automatique]
php-symfony-cache/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-config/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-console/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-dependency-injection/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-expression-language/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-filesystem/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-finder/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-polyfill-php80/oldstable,now 1.22.1-1 all  [installé, automatique]
php-symfony-process/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-service-contracts/oldstable,now 1.1.10-2+deb11u1 all  [installé, automatique]
php-symfony-var-exporter/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-symfony-yaml/oldstable,now 4.4.19+dfsg-2+deb11u6 all  [installé, automatique]
php-tcpdf/oldstable,now 6.3.5+dfsg1-1 all  [installé, automatique]
php-twig-i18n-extension/oldstable,now 3.0.0-2 all  [installé, automatique]
php-twig/oldstable-security,now 2.14.3-1+deb11u3 all  [installé, automatique]
php-xml/oldstable,now 2:7.4+76 all [installé, pouvant être mis à jour vers : 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c]
php-zip/oldstable,now 2:7.4+76 all [installé, pouvant être mis à jour vers : 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c]
php7.4-bz2/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-cli/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-common/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-curl/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-gd/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-intl/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-json/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-mbstring/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-mysql/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-opcache/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-readline/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-xml/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4-zip/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c amd64  [installé, automatique]
php7.4/bullseye,now 1:7.4.33-18+0~20241224.97+debian11~1.gbpaac02c all [installé, pouvant être supprimé automatiquement]
php8.3-bz2/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-cli/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-common/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-curl/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-gd/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-intl/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-mbstring/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-mysql/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-opcache/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-readline/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-xml/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3-zip/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 amd64  [installé]
php8.3/bullseye,now 8.3.16-1+0~20250119.51+debian11~1.gbpd60bd2 all  [installé]
php/bullseye,now 2:8.3+95+0~20240927.54+debian11~1.gbpe0084c all  [installé]
phpmyadmin/oldstable,now 4:5.0.4+dfsg2-2+deb11u1 all  [installé]

I have run

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sudo update-alternatives --config php

(I tried to do the same with phar) so that when I type

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php -v

I get :

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PHP 8.3.16 (cli) (built: Jan 19 2025 13:29:55) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.3.16, Copyright (c) Zend Technologies
    with Zend OPcache v8.3.16, Copyright (c), by Zend Technologies

But when I open a page with

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phpinfo();

I get :

title	value
Configuration File (php.ini) Path	/etc/php/7.4/apache2
Loaded Configuration File	/etc/php/7.4/apache2/php.ini
Scan this dir for additional .ini files	/etc/php/7.4/apache2/conf.d
Additional .ini files parsed	/etc/php/7.4/apache2/conf.d/10-mysqlnd.ini, /etc/php/7.4/apache2/conf.d/10-opcache.ini, /etc/php/7.4/apache2/conf.d/10-pdo.ini, /etc/php/7.4/apache2/conf.d/15-xml.ini, /etc/php/7.4/apache2/conf.d/20-bz2.ini, /etc/php/7.4/apache2/conf.d/20-calendar.ini, /etc/php/7.4/apache2/conf.d/20-ctype.ini, /etc/php/7.4/apache2/conf.d/20-curl.ini, /etc/php/7.4/apache2/conf.d/20-dom.ini, /etc/php/7.4/apache2/conf.d/20-exif.ini, /etc/php/7.4/apache2/conf.d/20-ffi.ini, /etc/php/7.4/apache2/conf.d/20-fileinfo.ini, /etc/php/7.4/apache2/conf.d/20-ftp.ini, /etc/php/7.4/apache2/conf.d/20-gd.ini, /etc/php/7.4/apache2/conf.d/20-gettext.ini, /etc/php/7.4/apache2/conf.d/20-iconv.ini, /etc/php/7.4/apache2/conf.d/20-intl.ini, /etc/php/7.4/apache2/conf.d/20-json.ini, /etc/php/7.4/apache2/conf.d/20-mbstring.ini, /etc/php/7.4/apache2/conf.d/20-mysqli.ini, /etc/php/7.4/apache2/conf.d/20-pdo_mysql.ini, /etc/php/7.4/apache2/conf.d/20-phar.ini, /etc/php/7.4/apache2/conf.d/20-posix.ini, /etc/php/7.4/apache2/conf.d/20-readline.ini, /etc/php/7.4/apache2/conf.d/20-shmop.ini, /etc/php/7.4/apache2/conf.d/20-simplexml.ini, /etc/php/7.4/apache2/conf.d/20-sockets.ini, /etc/php/7.4/apache2/conf.d/20-sysvmsg.ini, /etc/php/7.4/apache2/conf.d/20-sysvsem.ini, /etc/php/7.4/apache2/conf.d/20-sysvshm.ini, /etc/php/7.4/apache2/conf.d/20-tokenizer.ini, /etc/php/7.4/apache2/conf.d/20-xmlreader.ini, /etc/php/7.4/apache2/conf.d/20-xmlwriter.ini, /etc/php/7.4/apache2/conf.d/20-xsl.ini, /etc/php/7.4/apache2/conf.d/20-zip.ini

Now I tried :

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sudo a2enmod php8.3
sudo a2dismod php7.4

In this case

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sudo systemctl restart apache2

does not yield an error, but my page with phpinfo is blank and not even interpreted (the php code is visible inside it).

I don't really know what to do next (besides reverting to php7.4). Thanks for any help.

[donald]

Can you share the output of:

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update-alternatives --config php

(shows what is available

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update-alternatives --config php-fpm

(shows what is available)

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service --status-all | grep php

(shows which services are available)

[reinob]

somewhere in the apache configuration there will be the section where php is configured.
with nginx I have:

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upstream php-handler {
  server unix:/var/run/php/php8.2-fpm.sock;
}

you can have multiple versions of php installed, but you have to tell the web server which one to use. I don't think that the debian alternatives system takes care of that (but maybe I'm wrong).

[reinob]

add.: with apache I think you need to a2enconf php8.2-fpm.conf (or whatever).
or just make sure the right config file is linked to in /etc/apache2/conf-enabled/

[donald]

add.: with apache I think you need to a2enconf php8.2-fpm.conf (or whatever).
or just make sure the right config file is linked to in /etc/apache2/conf-enabled/

One can split the server php/apache-php/apache-cli along different php versions because they are each configured differently (call differently). I think you are correct that he needs to a2disconf/mod to the proper version.

[lzbk]

Thank you so much to both of you for your replies.

add.: with apache I think you need to a2enconf php8.2-fpm.conf (or whatever).
or just make sure the right config file is linked to in /etc/apache2/conf-enabled/

Indeed, as I explained in the original post, I do the following commands before I try the commands suggested by donald:

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sudo update-alternatives --set php /usr/bin/php8.3
sudo update-alternatives --set phar /usr/bin/phar8.3
sudo a2enmod php8.3
sudo a2dismod php7.4
sudo systemctl restart apache2

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update-alternatives --config php

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Il existe 3 choix pour l'alternative php (qui fournit /usr/bin/php).

  Sélection   Chemin                Priorité  État
------------------------------------------------------------
  0            /usr/bin/php.default   100       mode automatique
  1            /usr/bin/php.default   100       mode manuel
  2            /usr/bin/php7.4        74        mode manuel
* 3            /usr/bin/php8.3        83        mode manuel

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update-alternatives --config php-fpm

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update-alternatives: erreur: pas d'alternatives pour php-fpm

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service --status-all

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 [ - ]  apache-htcacheclean
 [ + ]  apache2
 [ + ]  apparmor
 [ - ]  console-setup.sh
 [ + ]  cron
 [ + ]  dbus
 [ - ]  hwclock.sh
 [ - ]  keyboard-setup.sh
 [ + ]  kmod
 [ - ]  lvm2
 [ - ]  lvm2-lvmpolld
 [ + ]  mariadb
 [ + ]  networking
 [ + ]  open-vm-tools
 [ + ]  procps
 [ - ]  rsync
 [ + ]  rsyslog
 [ + ]  ssh
 [ - ]  sudo
 [ + ]  udev
 [ + ]  unattended-upgrades
 [ - ]  x11-common

(except for the * before the alternative selected every command above returns the same whether I choose php7.4 or php8.3 — the only difference is that php scripts are not rendered when using php8.3 mod)

[lzbk]

NB : my test script is the following

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<!doctype html>
<html>
    <body>OK
    <?php
ini_set('display_errors', '1');
ini_set('display_startup_errors', '1');
error_reporting(E_ALL);
echo "ok";
phpinfo();
?>
    or not ?</body>
</html>

in php7.4 everything goes well, and in php8.3 the source code from the page is

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<html><head></head><body>OK
    <!--?php
ini_set('display_errors', '1');
ini_set('display_startup_errors', '1');
error_reporting(E_ALL);
echo "ok";
phpinfo();
?-->
    or not ?

</body></html>

[donald]

I think you do not have php-fpm installed, hence your error from earlier.

update-alternatives: erreur: pas d'alternatives pour php-fpm

Install php-fpm and its dependencies:

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sudo apt install -y php-fpm

Activate the proxy in apache2

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sudo a2enmod proxy_fcgi setenvif

Activate the configuration for apache2:

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sudo a2enconf php8.2-fpm

Enable php-fpm to start at boot:

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sudo systemctl enable php8.2-fpm

Start php-fpm:

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sudo systemctl start php8.2-fpm

Check the status:

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sudo systemctl status php8.2-fpm

Enable the alternatives:

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update-alternatives --config php-fpm

It should now be present here:

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service --status-all | grep php

Restart apache2:

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sudo systemctl restart apache2

[reinob]

Thank you so much to both of you for your replies.

add.: with apache I think you need to a2enconf php8.2-fpm.conf (or whatever).
or just make sure the right config file is linked to in /etc/apache2/conf-enabled/

Indeed, as I explained in the original post, I do the following commands before I try the commands suggested by donald:

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sudo update-alternatives --set php /usr/bin/php8.3
sudo update-alternatives --set phar /usr/bin/phar8.3
sudo a2enmod php8.3
sudo a2dismod php7.4
sudo systemctl restart apache2

You can enable the module (a2enmod) but you must configure apache to use it (a2enconf).
I don't see a2enconf in what you've written, but read donald's post which explains it in more detail.