php - define and heredoc

Question

How do you use define within a heredoc? For example:

define('PREFIX', '/holiday');

$body = <<<EOD
<img src="PREFIX/images/hello.png" />   // This doesn't work.
EOD;

Answer 1

taken from the documentation regarding strings

DEFINE('PREFIX','/holiday');

$const = PREFIX;

echo <<<EOD
<img src="{$const}/images/hello.png" /> 
EOD;