PHP form handling example in single page

This example shows a very simple form together with the form handling process on a single page.
 

<?php

//check if the submit variable exists
	if ($_POST['Submit']) {
	$mytext=$_POST['mytext'];
	echo "<BR>got submission<BR>";
	echo "<BR> you entered: $mytext<BR>";
	//process form action
} else { //no form has been submitted, so display the form
?>
<form name="form1" method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>">
  <input name="mytext" type="text" id="mytext">
  <input type="submit" name="Submit" value="Submit">
</form>
<?
}
?> 

Below is another approach based on Heredoc I like:

<?php

//check if the submit variable exists
	if ($_POST['Submit']) {
	$mytext=$_POST['mytext'];
	echo "<BR>got submission<BR>";
	echo "<BR> you entered: $mytext<BR>";
	//process form action
} else { //no form has been submitted, so display the form

	echo <<< HTML_TAG
	<form name="form1" method="post" action="{$_SERVER['PHP_SELF']}">
	  <input name="mytext" type="text" id="mytext">
	  <input type="submit" name="Submit" value="Submit">
	</form>
	HTML_TAG;
}
?>