"DATABASE ERROR: CONNECTION FAILED!" after PHP 7 upgrade

[poncho]

Hi,

I just upgraded from PHP 5.6 to PHP 7. Now RCM shows me this in the browser:

DATABASE ERROR: CONNECTION FAILED!

Unable to connect to the database!
Please contact your server-administrator.

The error log says:

[01-Feb-2016 15:12:09 +0000]: <96imeqv4> DB Error: SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client in /var/www/mail/program/lib/Roundcube/rcube_db.php on line 177 (GET /)
[01-Feb-2016 15:12:09 +0000]: <96imeqv4> DB Error: SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client (GET /)

Other apps are working like before (phpMyAdmin, Wordpress and self made apps).

Whats wrong with RCM and PHP 7?

[SKaero]

You will need to upgrade to Roundcube 1.2 beta in order to use PHP 7 with Roundcube.