Nasty Values :-)

From: Michael (araxnid_at_hotmail.com)
Date: 09/30/04 

Date: 30 Sep 2004 05:35:15 -0700

Hi!
 I have installed PHP 4.3.7 on Apache 2.0 on RH9.
 Everything seems to go well( When I run <?php phpinfo() ;?> it works)
 but I can't manage up with values.Even in the simplest programm, I
can't write out TEXTBOX's value:
<HTML>
<FORM>
Please type your name here:<BR>
<INPUT TYPE=TEXT NAME=username><BR><BR>
<INPUT TYPE=SUBMIT VALUE="Submit data">
</FORM>
<BR><BR>
You typed:
<?php
 echo($username);
?>
</HTML>

Output is:
You typed:

what it wrong?
 Thanks.