Hi guys,

Just started learning php here:

I encountered this error when i compiled/run (http://localhost:8080/howtodo/mergeforms.php) the code below:

Notice: Undefined index: submit in C:\Program Files\Apache Group\Apache2\htdocs\howtodo\mergeforms.php on line 11

filename: mergeforms.php

Code:
<html>
<body>
<?php
//if the "submit" variable does not exist
//form has not been submitted
//display initial page
if (!$_POST['submit'])      //this is line 11
{	
?>
	<form action ="<?=$_SERVER['PHP_SELF']?>" method="post">
	 Enter a number:<input name="number" size = "5">
 	<input type="submit" name="submit" value="go">
 	</form>
 <?php
}
else
{ 
	
	$number = $_POST['number'];
	if ($number > 0)
	{
		echo 'You entered a positive number';
	}
	elseif($number < 0)
	{
		echo 'You entered a negative number';
	}
	else
	{
		echo 'You entered a zero';
	}
}	
?>
</body>
</html>


Greg