PHP undefined index

Question

Heya I get this error message. I've been looking everywhere but I dont know how to fix it? Im a beginner so I'm really confued. Thanks in advance

Notice: Undefined index: cart in /nas/students/j/j39-green/unix/public_html/ISD5/inc/functions.inc.php on line 3

You have no items in your shopping cart

<?php
function writeShoppingCart() {
$cart = $_SESSION['cart'];
if (!$cart) {
    return '<p>You have no items in your shopping cart</p>';
} else {
    // Parse the cart session variable
    $items = explode(',',$cart);
    $s = (count($items) > 1) ? 's':'';
    return '<p>You have <a href="cart.php">'.count($items).' item'.$s.'  in your shopping cart</a></p>';
}
}

The error is in functions.Inc.php not your code

Toby Allen
– Toby Allen

2012-03-14 20:26:15 +00:00
Commented Mar 14, 2012 at 20:26 — Toby Allen
– Toby Allen, Commented Mar 14, 2012 at 20:26

Tim Withers · Accepted Answer · 2012-03-14 20:25:20Z

1

If $_SESSION['cart'] isn't set, it throws that warning.

Try:

$cart = isset($_SESSION['cart'])?$_SESSION['cart']:false;

answered Mar 14, 2012 at 20:25

Tim Withers

12.1k5 gold badges45 silver badges68 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

john smith · Accepted Answer · 2012-03-14 20:26:05Z

1

Use "EMPTY":

<?php
function writeShoppingCart() {
    $cart = !empty($_SESSION['cart']);
    if (!$cart) {
        return '<p>You have no items in your shopping cart</p>';
    } else {
        // Parse the cart session variable
        $items = explode(',',$cart);
        $s = (count($items) > 1) ? 's':'';
        return '<p>You have <a href="cart.php">'.count($items).' item'.$s.'  in your       shopping cart</a></p>';
    }
}

answered Mar 14, 2012 at 20:26

john smith

7333 gold badges8 silver badges18 bronze badges

Comments

Housni · Accepted Answer · 2012-03-14 20:30:24Z

1

This means that the key 'cart' does not exist in the $_SESSION superglobal array.

If it's alright for this value to not exist, you should be doing this:

$cart = false;
if (isset($_SESSION['cart'])) {
    $cart = $_SESSION['cart'];
}

You could use something called the ternary operator, in PHP, but since you're a beginner, I don't want to bombard you.

In development mode, it's alright to display errors but you should read more about disabling errors (error_reporting) and logging them (error_log()) so that they can be inspected without alarming visitors.

answered Mar 14, 2012 at 20:30

Housni

1,0032 gold badges12 silver badges23 bronze badges

Comments

Naftali · Accepted Answer · 2012-03-14 20:24:44Z

0

That means that your session does not contain $_SESSION['cart']

Try this instead:

$cart = isset($_SESSION['cart']) ? $_SESSION['cart'] : false;

answered Mar 14, 2012 at 20:24

Naftali

147k41 gold badges247 silver badges304 bronze badges

Comments

Bartek Kobyłecki · Accepted Answer · 2012-03-14 20:25:09Z

0

Try this:

$cart = isset($_SESSION['cart']) ? $_SESSION['cart'] : NULL;

answered Mar 14, 2012 at 20:25

Bartek Kobyłecki

2,39515 silver badges26 bronze badges

Comments

ThiefMaster · Accepted Answer · 2012-03-14 20:32:01Z

0

try initializing your $_SESSION with something like:

$_SESSION['cart'] = 0;    // zero items in cart

edited Mar 14, 2012 at 20:32

ThiefMaster

320k85 gold badges608 silver badges648 bronze badges

answered Mar 14, 2012 at 20:25

rogerlsmith

6,7982 gold badges22 silver badges27 bronze badges

Collectives™ on Stack Overflow

PHP undefined index

6 Answers 6

Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

6 Answers 6

Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related