Hello,
I understand that dokuwiki is not yet compatible with PHP8 (https://forum.dokuwiki.org/d/18802-php-8-compatibility and https://www.dokuwiki.org/requirements). As other services on my server require PHP8, I need to have it running by default. I tried to force dokuwiki to use PHP7.3, adding this to the apache config vhost config file:

<FilesMatch \.php>
        SetHandler "proxy:unix:/var/run/php/php7.3-fpm.sock|fcgi://localhost/"
</FilesMatch>

This works for other services installed on this server (which are also not compatible with PHP8). But it doesn't work with dokuwiki.

Any idea?

I include below an extract of the log:

[Mon Aug 30 09:52:08.125488 2021] [proxy_fcgi:error] [pid 24914:tid 140672195548928] [client 192.168.1.1:50916] AH01071: Got error 'PHP message: PHP Warning: Undefined array key "id" in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/edit.php on line 71PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'
[Mon Aug 30 09:52:08.205263 2021] [proxy_fcgi:error] [pid 24914:tid 140672195548928] [client 192.168.1.1:50916] AH01071: Got error 'PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561', referer: https://wiki.website.com/
[Mon Aug 30 09:52:08.794999 2021] [proxy_fcgi:error] [pid 24913:tid 140672178763520] [client 192.168.1.1:50917] AH01071: Got error 'PHP message: PHP Warning: Undefined array key "id" in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/edit.php on line 71PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'
[Mon Aug 30 09:52:08.864915 2021] [proxy_fcgi:error] [pid 24913:tid 140672145192704] [client 192.168.1.1:50917] AH01071: Got error 'PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561', referer: https://wiki.website.com/
[Mon Aug 30 09:52:09.393559 2021] [proxy_fcgi:error] [pid 24913:tid 140672145192704] [client 192.168.1.1:50917] AH01071: Got error 'PHP message: PHP Warning: Undefined array key "id" in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/edit.php on line 71PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'
[Mon Aug 30 09:52:09.901104 2021] [proxy_fcgi:error] [pid 24913:tid 140672145192704] [client 192.168.1.1:50917] AH01071: Got error 'PHP message: PHP Warning: Undefined array key "id" in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/edit.php on line 71PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'
[Mon Aug 30 09:52:12.129803 2021] [proxy_fcgi:error] [pid 24914:tid 140672195548928] [client 192.168.1.1:50920] AH01071: Got error 'PHP message: PHP Warning: Undefined array key "id" in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/edit.php on line 71PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'
[Mon Aug 30 09:52:12.192322 2021] [proxy_fcgi:error] [pid 24914:tid 140672195548928] [client 192.168.1.1:50920] AH01071: Got error 'PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561', referer: https://wiki.website.com/
[Mon Aug 30 10:04:36.988240 2021] [proxy_fcgi:error] [pid 25833:tid 139764289861376] [client 192.168.1.1:51942] AH01071: Got error 'PHP message: PHP Warning: Undefined array key "id" in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/edit.php on line 71PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'
[Mon Aug 30 10:17:34.433454 2021] [proxy_fcgi:error] [pid 26888:tid 140324890830592] [client 192.168.1.1:62887] AH01071: Got error 'PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'
[Mon Aug 30 10:17:36.345854 2021] [proxy_fcgi:error] [pid 26888:tid 140324890830592] [client 192.168.1.1:62887] AH01071: Got error 'PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'
[Mon Aug 30 10:17:37.780825 2021] [proxy_fcgi:error] [pid 26888:tid 140324916008704] [client 192.168.1.1:62887] AH01071: Got error 'PHP message: PHP Warning: Constant FCK_ACTION_SUBDIR already defined in /var/www/html/dokuwiki/lib/plugins/ckgedit/action/save.php on line 7PHP message: PHP Fatal error: Array and string offset access syntax with curly braces is no longer supported in /var/www/html/dokuwiki/lib/plugins/include/helper.php on line 561'

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