PHP Undefined Index Error - Passing Value From Hidden Input

Question

I am receiving this error when trying to pass a value via hidden input in a form. I have used this multiple times before, and I can't seem to figure out why it is not passing this time in particular.

Code from the form on index:

<form method="post" action="viewchars.php">
    <input type="hidden" name="uname" value="testuser" />
</form>

Code on viewchars.php:

<?php
    $user = $_POST["uname"];
?>

The error states that uname is the undefined index.

I am not trying to get the error to just go away, as I actually need the value being passed for the viewchars.php page.

Answer 1

just remove "/" form end of input line! like this...

<form method="post" action="viewchars.php"> <input type="hidden" name="uname" value="testuser" > </form>

Answer 2

add submit button in your html

<form method="post" action="viewchars.php">
    <input type="hidden" name="uname"  value="testuser" />
    <input type="submit" value="Submit"/>
</form>

Answer 3

If you are sending this via JS make sure you are actually using POST. Have you tried to test on $_REQUEST, instead?

Also, try:

• use a submit button just to test

• make the input visible and type text to test

• change var name

• try a print_r($_REQUEST); on the php side to see what is received

Answer 4

try the following:

$user = $_POST['uname'];

Answer 5

You have to make sure the form is submitted before using POST values. So it should be something like

$user = isset($_POST['uname']) ? $_POST['uname'] : '';