public function addExternalTool($externalTool) { if (!isset($_SESSION)) { session_start(); } $lms = strtoupper($_SESSION['lms']); switch ($lms) { case Lms::CANVAS: $canvas = new CanvasHelper(); return $canvas->addExternalTool($externalTool); default: $canvas = new CanvasHelper(); return $canvas->addExternalTool($externalTool); } }