Better handling of sending response content.

framework/yii/web/Response.php

@@ -319,8 +319,14 @@ class Response extends \yii\base\Response
 	 */
 	protected function sendContent()
 	{
+		if (is_array($this->content)) {
+			echo 'array()';
+		} elseif (is_object($this->content)) {
+			echo method_exists($this->content, '__toString') ? (string)$this->content : get_class($this->content);
+		} else {
 			echo $this->content;
 		}
+	}
 
 	/**
 	 * Sends a file to the browser.
@@ -723,13 +729,13 @@ class Response extends \yii\base\Response
 		}
 
 		switch ($this->format) {
-			case self::FORMAT_RAW:
-				$this->content = $this->data;
-				break;
 			case self::FORMAT_HTML:
 				$this->getHeaders()->setDefault('Content-Type', 'text/html; charset=' . $this->charset);
 				$this->content = $this->data;
 				break;
+			case self::FORMAT_RAW:
+				$this->content = $this->data;
+				break;
 			case self::FORMAT_JSON:
 				$this->getHeaders()->set('Content-Type', 'application/json');
 				$this->content = Json::encode($this->data);