Question

Possible Duplicate:
PHP: “Notice: Undefined variable” and “Notice: Undefined index”

This is strange but I am posting an input using the $_POST method which is below:

$c = count($_POST['gridValues']);

But the problem is that I am receiving an error stating:

Notice: Undefined index: gridValues in /web/stud/…./ on line 40
(which is line above)

How come I am receiving this error because the $_POST method is definitly correct?

Below is the whole code:

<?php

ini_set('session.gc_maxlifetime',12*60*60);
ini_set('session.gc_divisor', '1');
ini_set('session.gc_probability', '1');
ini_set('session.cookie_lifetime', '0');
require_once 'init.php'; 

 ini_set('display_errors',1); 
 error_reporting(E_ALL);


session_start();

?>

$i = 0;
$c = count($_POST['gridValues']);

for($i = 0;  $i < $c; $i++ ){

    switch ($_POST['gridValues'][$i]){

 case "3": 
    $selected_option = "A-C";
    break;

    case "4": 
    $selected_option = "A-D";
    break;

    case "5": 
    $selected_option = "A-E";
    break;
}
}

Answer 1

You need to check if it is set first:

<?php

if(isset($_POST['gridValues'])) {
   $c = count($_POST['gridValues']);
}
?>