session_write_close(): Session callback expects true/false return value

[lcharette]

• Laravel Version: 5.3
• PHP Version: 7.0.8

Description:

Since I upgraded my test server to php7, I get this warning in the logs :

PHP Warning:  session_write_close(): Session callback expects true/false return value in Unknown on line 0
PHP Warning:  session_write_close(): Failed to write session data (user). Please verify that the current setting of session.save_path is correct (/var/lib/php/sessions) in Unknown on line 0

We use Illuminate/Session FileSessionHandler (See here).

According to this thread, the write method of the session handler needs to return true. Adding return true; here will fix the warning message : https://github.com/illuminate/session/blob/master/FileSessionHandler.php#L81-L84

This probably apply to other Session handler inside Illuminate/Session as well.

[GrahamCampbell]

We don't use the session_write_close function?

[lcharette]

From what I understand, session_write_close is called during a normal shutdown, so when a page is done loading.

See: http://php.net/manual/en/sessionhandlerinterface.write.php

[lcharette]

Turns out this warning can also be fired when session_destroy and session_regenerate_id is called...