Heredoc Syntax - Variable Question

[Jip]

What is the appropriate syntax to use for the following code when using heredoc syntax?

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">

I know I need to remove the php tag and probably the echo statement but what about the single quotes? Any feedback is appreciated.

[laserlight]

echo <<<EOD
<form action="{$_SERVER['PHP_SELF']}" method="post">
EOD;