yii2-app-basic/commands/HelloController.php

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace app\commands;
use yii\console\Controller;

/**
 * This command echos what the first argument that you have entered.
 *
 * This command is provided as an example for you to learn how to create console commands.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class HelloController extends Controller
{
	/**
	 * This command echos what you have entered as the message.
	 * @param string $message the message to be echoed.
	 */
	public function actionIndex($message = 'hello world')
	{
		echo $message."\n";
	}
}