What's wrong with this PHP code?

J

Jordan

New member
<html>
<head>
<title>Merging Forms and Their Result Pages with Conditional Statements</title>
</head>

<body>

<?php

if (!$_POST['submit'])
{

?>


<form action="<?=$_SERVER['PHP_SELF']?>" method="post">
Enter a number: <input name="number" size="2">
<input type="submit" name="submit" value="Go">
</form>

<?php
}
else
{

$number = $_POST['number'];

if ($number > 0)
{
echo 'You entered a positive number';
}
else if ($number < 0)
{
echo 'You entered a negative number';
}
else
{
echo 'You entered 0';
}
}
?>

</body>
</html>



I just receive a message like this:

Notice: Undefined index: submit in /opt/lampp/htdocs/Studies/Merging Forms and Their Result Pages with Conditional Statements.php on line 10


Please explain.

Thanks.
 
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