(Yaf >=1.0.0)
Yaf_Response_Abstract::setBody — Set content to response
$content
   [, string $key
  ] )Set content to response
bodycontent string
keythe content key, you can set a content with a key, if you don't specific, then Yaf_Response_Abstract::DEFAULT_BODY will be used
Note:
this parameter is introduced as of 2.2.0
Example #1 Yaf_Response_Abstract::setBody()example
<?php
$response = new Yaf_Response_Http();
$response->setBody("Hello")->setBody(" World", "footer");
print_r($response);
echo $response;
?>
The above example will output something similar to:
Yaf_Response_Http Object
(
    [_header:protected] => Array
        (
        )
    [_body:protected] => Array
        (
            [content] => Hello
            [footer] =>  World
        )
    [_sendheader:protected] => 1
    [_response_code:protected] => 200
)
Hello World