Depecrecation in session_set_save_handler() method with PHP 8.4

[vmario89]

Prerequisites

• I have searched for duplicate or closed issues
• I can recreate the issue with all plugins disabled

Describe the issue

Hi,
since updating Roundcube 1.6.9 to use PHP8.4 i get a spam flood of deprecations in the session handler. The issue persists, even when i disable all plugins.

In the install notes it's recommended to have PHP greater 7.3 - i did not read anything about upper limit of the version. https://github.com/roundcube/roundcubemail/blob/release-1.6/INSTALL

this comes from nginx error log file:

2025/02/03 10:38:24 [error] 3918174#3918174: *236159 FastCGI sent in stderr: "PHP message: PHP Deprecated:  session_set_save_handler(): Providing individual callbacks instead of an object implementing SessionHandlerInterface is deprecated in /var/www/roundcube/program/lib/Roundcube/rcube_session.php on line 119" while reading response header from upstream, client: REDACTED, server: REDACTED.REDACTED.REDACTED, request: "GET /robots.txt HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm/php84.sock:", host: REDACTED

thank you!

What browser(s) are you seeing the problem on?

Other

What version of PHP are you using?

8.4

What version of Roundcube are you using?

1.6.9

JavaScript errors

No response

PHP errors

No response

[alecpl]

This has been solved in master, but the change is quite big, so I don't plan a backport. You should be able to configure PHP to do not log such errors.

Some other deprecation warnings are also expected in 1.6 under PHP >= 8.4.