PHP Manual: The prependBody purpose

public bool Yaf_Response_Abstract::prependBody(string $content, string $key = ?)

prepend a content to a exists content block

body

content string

key

the 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

bool

Example #1 Yaf_Response_Abstract::prependBodyexample

<?php
$response = new Yaf_Response_Http();

$response->setBody("World")->prependBody("Hello ");

echo $response;
?>

The above example will output something similar to:

Hello World

Yaf_Response_Abstract::prependBody