Undefined variable: session

PHP
1

Sir, I have these codes on the top of connectionstring

ini_set('session.save_handler', 'files');
session_set_save_handler($session, true);
session_save_path(__DIR__ . '/sessions');
session_start();

There is folder named sessions in include folder to save session information.
connectsql.php is in include folder and index.php in at root.

But when I try to run my website then this error message appears

Notice: Undefined variable: session in D:\DZHosts\LocalUser\SilentHeart\www.asia.abc.com\includes\connectsql.php on line 4

Warning: session_set_save_handler() expects parameter 1 to be SessionHandlerInterface, null given in D:\DZHosts\LocalUser\SilentHeart\www.asia.abc.com\includes\connectsql.php on line 4

Please help me how to store session information?

2 
session_save_path(__DIR__ . '/sessions');
session_start();

‘files’ is the default save handler.

3

‘files’ means?

4

http://php.net/manual/en/session.configuration.php#ini.session.save-handler

5

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