simple form validation..help needed

[jonleow]

i have a form which i need to validate. Form is as follow:

<form action="processform1.php" method="post">

<table width="75%" border="0">
<tr>
<td width="15%">First Name</td>
<td width="85%"><input type="text" name="firstName" size="50"></td>
</tr>
<tr>
<td>Midldle Name</td>
<td><input name="middleName" type="text" size="50"></td>
</tr>
<tr>
<td>Last Name</td>
<td><input name="lastName" type="text" size="50"></td>
</tr>
</table>

<td><input type="submit" name="Submit Now"></td>
</form>

And this is my validating program:

<?php

if ($firstName == "")
echo "Please enter your firstName";
elseif ($middleName =="")
echo "PLease enter your middleName";
elseif ($lastName == "")
echo "Please neter your lastName";

?>



ANd i got this error while validating the form:
Notice: Undefined variable: firstName in C:\Apache Group\Apache2\htdocs\pg\processform1.php on line 8


Can someone explain to me why is this so? Thank you.

[Yami King]

$firstname isn't declared so it returns an error. What you could do is, what I always do:

[jonleow]

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

if the validating coding is residing in another page, what must i modify in the above line of code?

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

[Yami King]

I said I put it in one single page, but if you want multiple pages you use this:

[jonleow]

ok it works now..thank you very much!