php - Session issues in codeigniter -

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i using codeigniter. can't store values in session because whenever refresh page session id changing. 

$config['sess_cookie_name']         = 'ci_session'; $config['sess_expiration']          = 7200; $config['sess_expire_on_close']     = true; $config['sess_encrypt_cookie']      = true; $config['sess_use_database']        = true; $config['sess_table_name']          = 'ci_sessions'; $config['sess_match_ip']            = false; $config['sess_match_useragent']     = true; $config['sess_time_to_update']      = 300;


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