PHP 7 support?

[chocolatkey]

When used with PHP 7, uLogin is still usable, but I am constantly getting:
Warning: session_write_close(): Session callback expects true/false return value in Unknown on line 0
Warning: session_write_close(): Failed to write session data (user). Please verify that the current setting of session.save_path is correct (c:/web/tmp) in Unknown on line 0
Does this warning affect uLogin's security? I looked this up, and it seems to be a problem with other frameworks that was fixed, but I'm not sure how to fix it in uLogin. The debug log seems normal as well:
• 0.0194 Session start requested by host.
• 0.0281 isNew: 1
• 0.0282 Starting a new uLogin session.
• 0.1857 New session id requested by host.
• 0.1857 Changing session id.
• 0.2024 New ID ndo97lrkh31f4pmvcqtlv5qhs7

[rjl20]

I think the problem is in ulogin/pdo/PdoSessionStorage.inc.php -- the write function needs to return true if it doesn't return false. Adding a "return true;" as its last line seems to have made it start working again for me.