What group and rights should be on the /var/lib/php/session folder?

Question

ubuntu

I start the session session_start()
and I get this error

Warning: session_start(): open(/var/lib/php/sessions/sess_8evj8v24fo5trepoa9d436av74, O_RDWR) failed: Permission denied (13) in /var/www/test.site/public_html/test.php on line 7

The /var/lib/php/sessions folder has permissions set to drwxr-xr-x 2 serii www-data 4096 Sep 9 10:32 sessions/
Probably the wrong group, but what permissions should be set on the sessions folder?

Answer 1

Such that the php user has the right to write there.
If you have one php user, then it should belong to him, if there are several, then adjust the rights with group policies.