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I am upgrading a server from Debian 9 (stretch) to Debian 10 (buster), and am aware (and intend) that this results in PHP being upgraded from PHP 7.0 to PHP 7.3.

php -v does indeed show that PHP 7.3 is installed, but when trying to login to the web application running on the server, I get a (vague) error message, and, when I create a test page to run phpinfo, it shows that Apache still seems to be running PHP 7.0.

I had expected that Apache would switch to using PHP 7.3 as part of the OS upgrade. What do I need to do to make Apache now use PHP 7.3?

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    Did your upgrade install libapache2-mod-php7.3? Did you enable the apache module?
    – Panki
    CommentedAug 25, 2020 at 14:56
  • I followed the upgrade instructions at debian.org/releases/buster/amd64/release-notes/… How can tell if libapache2-mod-php7.3 is installed, and what do I need to do to enable the module?
    – dave559
    CommentedAug 25, 2020 at 15:01
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    dpkg -l | grep ^i | grep libapache2-mod-php7.3 will show you. If it doesn't return anything, its not installed. a2enmod enables apache modules.
    – Panki
    CommentedAug 25, 2020 at 15:05
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    Thank you. It turned out that I had to a2enmod php7.3 but also a2dismod php7.0 (and then systemctl restart apache2). Feel free to write up as an answer so that I can credit you.
    – dave559
    CommentedAug 25, 2020 at 15:10

1 Answer 1

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Proper answer from comments:

The upgrade probably did not install the libapache2-mod-php7.3 package, which is required to integrate php7.3 into apache2.

To check if it is already installed, run

dpkg -l | grep ^i | grep libapache2-mod-php7.3

If this doesn't return anything, it needs to be installed.

apt install libapache2-mod-php7.3

Afterwards, disable the old apache2 module and activate the new:

a2dismod php7.0 && a2enmod php7.3 && systemctl restart apache2
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