use Symfony\Component\HttpFoundation\Cookie;
    
	$header = "Set-Cookie: bjt_track=firstVisit=2019-09-23 06:18:41&sessionsCount=14&previousVisit=2019-09-23 06:26:37&lastVisit=2019-09-23 06:27:09; expires=Tue, 22-Sep-2020 06:27:09 GMT; path=/";

	$parts = explode(": ", $header, 2); 

	var_dump(Cookie::fromString($parts[1]));

/* OUTPUT: 

object(Symfony\Component\HttpFoundation\Cookie)#3 (10) {
  ["name":protected]=>
  string(9) "bjt_track"
  ["value":protected]=>
  string(10) "firstVisit"    <--- Note the broken value here
  ["domain":protected]=>
  NULL
  ["expire":protected]=>
  int(1600756029)
  ["path":protected]=>
  string(1) "/"
  ["secure":protected]=>
  bool(false)
  ["httpOnly":protected]=>
  bool(false)
  ["raw":"Symfony\Component\HttpFoundation\Cookie":private]=>
  bool(true)
  ["sameSite":"Symfony\Component\HttpFoundation\Cookie":private]=>
  NULL
  ["secureDefault":"Symfony\Component\HttpFoundation\Cookie":private]=>
  bool(false)
}
*/