"Undefined index" notice after submitting HTML form

Question

So I have a sign up form, and there is some PHP at the top of the code. It gives me this error:

Notice: Undefined index: register in /home/content/04/7195304/html/index.php on line 20

This is line 20:

if ($_POST['register']) {

Here is the submit button:

<input type="submit" class="gobutton" value="Register" name="register"/>

Edit

So here's my form tags:

<form action="index.php" method="POST">

You have not shown us enough code. In particular, you haven't demonstrated your <form> tags. Perhaps you're using GET not POST. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Feb 26, 2011 at 16:35

mailo · Accepted Answer · 2011-02-26 16:33:44Z

8

You should check it like this:

if ( isset($_POST['register']) ) {}

to avoid getting notice.

answered Feb 26, 2011 at 16:33

mailo

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2 Comments

Lightness Races in Orbit Over a year ago

-1 If the field is in the right form, and the form method is POST, then the variable will be set even if it's empty. I agree that it's wise to use isset where you can, but this is not the OP's problem.

mailo Over a year ago

I agree, additionally you should perform !empty() check.

Nick Clark · Accepted Answer · 2011-02-26 16:35:18Z

Is your form using method="GET" instead of method="POST"?

You can also add addition checks to make sure the index exists, like this:

if (isset($_POST['register'])) { // do stuff }

You can also debug the form submission like this:

var_dump($_POST);

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