IIS 7 and Above
IIS 8.5 PHP can't change session.save_path
Re: IIS 8.5 PHP can't change session.save_path
Apr 30, 2019 06:09 AM|JiriP|LINK
Thank you Jalpa!
I've missed that forrum on serverfault during my googling for solution. That
webplatform installer section [WebPIChanges] at the end of php.ini file was the reason. It overided more settings in regular php.ini file.
It is quite confusing that something like this is done by installer, duplicating variables in php.ini without any warning.