Codeigniter session is not working on PHP 7

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Recently I’ve faced the same problem by upgrading my php version from 5.6 to 7.1 My development environment is XAMPP (Apache + MariaDB) using php7.1.4

Please follow the below steps:

1) Go to system/libraries/Session/Session.php

2) Comment session_start() by adding //.

3) Go down to line around 312-315 where it says Security is king, and comment out the following lines:

ini_set('session.use_trans_sid', 0);
ini_set('session.use_strict_mode', 1);
ini_set('session.use_cookies', 1);
ini_set('session.use_only_cookies', 1);
ini_set('session.hash_function', 1);
ini_set('session.hash_bits_per_character', 4);

4) Then go to your main index.php ( the root index.php )

5) Add session_start() at the top once.

It works for me.