[Forum] Character encoding fails when session is expired

[Mn3m0n1c]

Hello everyone,
i have this problem after upgrade to PHP7.

When a user session expires while writing a post, encoding fails for these characters: à è ì ò ù
User send the post, vbulletin requires the authentication and redirects to insert script, and the post result is: èòÃ*ùì
Nothing strange happens if the session is still valid!

I attach an image of some tests, one with session OK, and the other KO

Tried to completely disable system plugin/hooks and use default Skin, but problem persists.

This is my environment:
PHP 7.1.13
Apache v2.4.6
Vbulletin 4.2.5
CentOS 7

To reproduce the issue in one fresh VB installation:
- log in
- open a first reply box in one random thread
- duplicate tab in your browser
- log off from the duplicated tab
- write some "ò è ù à" in the first box, and post a reply

[Mn3m0n1c]

Please, nobody can reproduce the problem? Need some other information?

[Pogo]

You can apply this diff to your files to fix this issue.

Either with a patch program or manually.

[Mn3m0n1c]

Thank you so much Pogo!