When I was upgrading my apps to Codeigniter 3, I got an error message on my development server.
A PHP Error was encountered
Severity: Core Warning
Message: Module ‘timezonedb’ already loaded
Line Number: 0
Actually, it wasn’t Codeigniter error. It was the server. It seems the server duplicated loading timezonedb module. I searched on google and never got satisfaction answer. The worst is many people suggest by hidden its error message.
Luckily, I used Cpanel to manage my server and I found Cpanel forum old thread, it said to edit my php.ini if you use latest Cpanel version, you will find that it has multi-PHP version. So you should check php.ini for the PHP version you used for application. Since, mine was 5.6 so I edited this file
then search and comment out this line
; date.timezone = “UTC”
remember this “;” is comment mark for php.ini.