Allow using string for URL in case there are no parameters

docs/guide/url.md

@@ -37,7 +37,7 @@ echo \Yii::$app->urlManager->createUrl(['site/page', 'id' => 'about']);
 // /index.php/site/page/id/about/
 echo \Yii::$app->urlManager->createUrl(['date-time/fast-forward', 'id' => 105])
 // /index.php?r=date-time/fast-forward&id=105
-echo \Yii::$app->urlManager->createAbsoluteUrl(['blog/post/index']);
+echo \Yii::$app->urlManager->createAbsoluteUrl('blog/post/index');
 // http://www.example.com/index.php/blog/post/index/
 ```
 
@@ -57,9 +57,9 @@ Inside a web application controller, you can use the controller's `createUrl` sh
 ```php
 echo $this->createUrl(''); // currently active route
 echo $this->createUrl(['view', 'id' => 'contact']); // same controller, different action
-echo $this->createUrl(['post/index']); // same module, different controller and action
-echo $this->createUrl(['/site/index']); // absolute route no matter what controller is making this call
-echo $this->createurl(['hi-tech']); // url for the case sensitive action `actionHiTech` of the current controller
+echo $this->createUrl('post/index'); // same module, different controller and action
+echo $this->createUrl('/site/index'); // absolute route no matter what controller is making this call
+echo $this->createurl('hi-tech'); // url for the case sensitive action `actionHiTech` of the current controller
 echo $this->createurl(['/date-time/fast-forward', 'id' => 105]); // url for action the case sensitive controller, `DateTimeController::actionFastForward`
 ```
 
@@ -114,11 +114,11 @@ Let's use some examples to explain how URL rules work. We assume that our rule s
 ]
 ```
 
-- Calling `$this->createUrl(['post/list'])` generates `/index.php/posts`. The first rule is applied.
+- Calling `$this->createUrl('post/list')` generates `/index.php/posts`. The first rule is applied.
 - Calling `$this->createUrl(['post/read', 'id' => 100])` generates `/index.php/post/100`. The second rule is applied.
 - Calling `$this->createUrl(['post/read', 'year' => 2008, 'title' => 'a sample post'])` generates
   `/index.php/post/2008/a%20sample%20post`. The third rule is applied.
-- Calling `$this->createUrl(['post/read'])` generates `/index.php/post/read`. None of the rules is applied, convention is used
+- Calling `$this->createUrl('post/read')` generates `/index.php/post/read`. None of the rules is applied, convention is used
   instead.
 
 In summary, when using `createUrl` to generate a URL, the route and the `GET` parameters passed to the method are used to

extensions/gii/controllers/DefaultController.php

@@ -110,8 +110,9 @@ class DefaultController extends Controller
 	/**
 	 * @inheritdoc
 	 */
-	public function createUrl(array $params)
+	public function createUrl($params)
 	{
+		$params = (array)$params;
 		if (!isset($params['id']) && $this->generator !== null) {
 			foreach ($this->module->generators as $id => $generator) {
 				if ($generator === $this->generator) {

extensions/gii/generators/controller/Generator.php

@@ -149,9 +149,9 @@ class Generator extends \yii\gii\Generator
 	{
 		$actions = $this->getActionIDs();
 		if (in_array('index', $actions)) {
-			$route = [$this->controller . '/index'];
+			$route = $this->controller . '/index';
 		} else {
-			$route = [$this->controller . '/' . reset($actions)];
+			$route = $this->controller . '/' . reset($actions);
 		}
 		$link = Html::a('try it now', Yii::$app->getUrlManager()->createUrl($route), ['target' => '_blank']);
 		return "The controller has been generated successfully. You may $link.";

extensions/gii/generators/module/Generator.php

@@ -84,7 +84,7 @@ class Generator extends \yii\gii\Generator
 	public function successMessage()
 	{
 		if (Yii::$app->hasModule($this->moduleID)) {
-			$link = Html::a('try it now', Yii::$app->getUrlManager()->createUrl([$this->moduleID]), ['target' => '_blank']);
+			$link = Html::a('try it now', Yii::$app->getUrlManager()->createUrl($this->moduleID), ['target' => '_blank']);
 			return "The module has been generated successfully. You may $link.";
 		}
 

framework/web/Controller.php

@@ -159,11 +159,12 @@ class Controller extends \yii\base\Controller
 	 *
 	 * After this route conversion, the method calls [[UrlManager::createUrl()]] to create a URL.
 	 *
-	 * @param array $params route and parameters in form of ['route', 'param1' => 'value1', 'param2' => 'value2']
+	 * @param string|array $params route as a string or route and parameters in form of ['route', 'param1' => 'value1', 'param2' => 'value2']
 	 * @return string the created relative URL
 	 */
-	public function createUrl(array $params)
+	public function createUrl($params)
 	{
+		$params = (array)$params;
 		$params[0] = $this->getNormalizedRoute($params[0]);
 		return Yii::$app->getUrlManager()->createUrl($params);
 	}
@@ -182,13 +183,14 @@ class Controller extends \yii\base\Controller
 	 *
 	 * After this route conversion, the method calls [[UrlManager::createUrl()]] to create a URL.
 	 *
-	 * @param array $params route and parameters in form of ['route', 'param1' => 'value1', 'param2' => 'value2']
+	 * @param string|array $params route as a string or route and parameters in form of ['route', 'param1' => 'value1', 'param2' => 'value2']
 	 * @param string $schema the schema to use for the url. e.g. 'http' or 'https'. If not specified
 	 * the schema of the current request will be used.
 	 * @return string the created absolute URL
 	 */
-	public function createAbsoluteUrl(array $params, $schema = null)
+	public function createAbsoluteUrl($params, $schema = null)
 	{
+		$params = (array)$params;
 		$params[0] = $this->getNormalizedRoute($params[0]);
 		return Yii::$app->getUrlManager()->createAbsoluteUrl($params, $schema);
 	}

framework/web/UrlManager.php

@@ -228,11 +228,12 @@ class UrlManager extends Component
 	/**
 	 * Creates a URL using the given route and parameters.
 	 * The URL created is a relative one. Use [[createAbsoluteUrl()]] to create an absolute URL.
-	 * @param array $params route and parameters in form of ['route', 'param1' => 'value1', 'param2' => 'value2']
+	 * @param string|array $params route as a string or route and parameters in form of ['route', 'param1' => 'value1', 'param2' => 'value2']
 	 * @return string the created URL
 	 */
-	public function createUrl(array $params)
+	public function createUrl($params)
 	{
+		$params = (array)$params;
 		$anchor = isset($params['#']) ? '#' . $params['#'] : '';
 		unset($params['#'], $params[$this->routeParam]);
 
@@ -275,14 +276,15 @@ class UrlManager extends Component
 	/**
 	 * Creates an absolute URL using the given route and parameters.
 	 * This method prepends the URL created by [[createUrl()]] with the [[hostInfo]].
-	 * @param array $params route and parameters in form of ['route', 'param1' => 'value1', 'param2' => 'value2']
+	 * @param string|array $params route as a string or route and parameters in form of ['route', 'param1' => 'value1', 'param2' => 'value2']
 	 * @param string $schema the schema to use for the url. e.g. 'http' or 'https'. If not specified
 	 * the schema of the current request will be used.
 	 * @return string the created URL
 	 * @see createUrl()
 	 */
-	public function createAbsoluteUrl(array $params, $schema = null)
+	public function createAbsoluteUrl($params, $schema = null)
 	{
+		$params = (array)$params;
 		$url = $this->createUrl($params);
 		if (strpos($url, '://') === false) {
 			$url = $this->getHostInfo($schema) . $url;