Source

373 
374 			// Allow storing the session in a non standard location
375 			if($session_path) session_save_path($session_path);
376 
377 			// If we want a secure cookie for HTTPS, use a seperate session name. This lets us have a
378 			// seperate (less secure) session for non-HTTPS requests
379 			if($secure) session_name('SECSESSID');
380 
381 			if($sid) session_id($sid);
382 			session_start();
383 
384 			$this->data = isset($_SESSION) ? $_SESSION : array();
385 		}
386 
387 		// Ensure session is validated on start
388 		$this->expireIfInvalid();

Trace

• session_start()
  Session.php:382
• Session->inst_start()
  Director.php:139
• Director::direct(/,DataModel)
  main.php:194