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Yaf_Response_Abstract::__toString() is a magic method in the Yaf framework for PHP. This method is used to convert the response object into a string representation.

Here is a detailed explanation of how it works:

1. When an instance of Yaf_Response_Abstract is echoed or used in a string context, the __toString() method is automatically called.

2. The __toString() method checks if there is a custom response body set in the response object. If yes, it returns the body as a string.

3. If no custom response body is set, the __toString() method checks if there is a view object associated with the response. If yes, it renders the view and returns the rendered output as a string.

4. If both a custom response body and a view object are not set, the __toString() method returns an empty string.

To provide a more specific example, let's say you have the following code:

$response = new Yaf_Response_Http();
$response->setBody("Hello World");

When you echo or use the $response variable in a string context, the __toString() method will be called, and it will return "Hello World" as the output.

Note that this explanation is based on the Yaf framework's implementation. If you are using a different framework or a customized version of Yaf, the behavior of the __toString() method may vary.