// Include the SwiftMailer autoloader require_once('/path/to/swiftmailer/lib/swift_required.php'); // Register the autoloader Yii::registerAutoloader(['Swift', 'autoload']);
// Define the namespace for the custom class library namespace Custom; // Define the autoloader function function autoload($className) { $classFile = str_replace('\\', '/', $className) . '.php'; require_once($classFile); } // Register the autoloader Yii::registerAutoloader(['Custom', 'autoload']);In this example, a custom class library is defined, with a namespace of 'Custom'. An autoloader function is then defined, which converts the namespace/class name into a file path and requires the file. Finally, the registerAutoloader function is called with an array containing the namespace and function name of the autoloader.