No not when I edit it
it looks like
/* PHP CODE HERE, IF NECESSARY */
the php body of your custom box here
/* DO NOT CHANGE THE LINE BELOW. IT IS REQUIRED. */
$body = <<<EOF
the html body of your custom box here
EOF;
/* DO NOT CHANGE THE LINE ABOVE. IT IS REQUIRED. */
but when I then view it on the server it looks like
<?php
/* PHP CODE HERE, IF NECESSARY */
the php body of your custom box here
/* DO NOT CHANGE THE LINE BELOW. IT IS REQUIRED. */
$body = <<<EOF
the html body of your custom box here
EOF;
/* DO NOT CHANGE THE LINE ABOVE. IT IS REQUIRED. */
?>