PHP $_session is not work in wordpress

Yes, you must use a small change for use session in WordPress.

if ( ! session_id() )
session_start();

Better you use a custom function 

function my_start_session() {

@session_cache_limiter('private, must-revalidate'); //private_no_expire
@session_cache_expire(0);
@session_start();
}

*Please edit, I write from a mobile

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