Can someone hellp me out here? I keep getting this message:
Warning: Cannot use a scalar value as an array in /data/.../class.cart.php on line 56

Here's the code:

  function addCartItem($name, $color, $size) {
    global $database;

$sql = "SELECT product_id FROM products WHERE product_name='$name' AND product_color='$color' AND product_size='$size' LIMIT 1";
$result = $database->query($sql);
$row = mysql_fetch_array($result);

/* LINE 56 BELOW */  

$_SESSION['cart'][$row['product_id']] = ( $_SESSION['cart'][$row['product_id']] + 1 );

return TRUE;
  }

    Use [man]is_array/man/[man]var_dump/man to verify that $row and $_SESSION['cart'] are both arrays.

    If $row isn't an array, debug your SQL query.

      Well, I did as you suggested, and I'm totally lost...

      First, I changed the code above to:

        function addCartItem($name, $color, $size) {
    global $database;

$sql = "SELECT product_id FROM products WHERE product_name='$name' AND product_color='$color' AND product_size='$size' LIMIT 1";
$result = $database->query($sql);
$row = mysql_fetch_array($result);

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

if(is_array($row)) {
	if(is_array($_SESSION['cart'])) {
    $_SESSION['cart'][$row['product_id']] = ( $_SESSION['cart'][$row['product_id']] + 1 );
    return TRUE;
    } else {
	print_r($_SESSION);
	echo '<p>';
	var_dump($_SESSION);
    }
} else {
	print_r($_SESSION);
	echo '<p>';
	var_dump($_SESSION);
}
  }

      And it output this:

      Array ( [url] => /dev_site/viewcart.php [cart] => ) 
array(2) { ["url"]=> &string(22) "/dev_site/viewcart.php" ["cart"]=> string(0) "" }

      It works fine on one server, but I move it to a shared hosting environment and this happens...

        is $row returning any errors or even any rows?

        Try the following

        $row = mysql_fetch_array($result) or die( mysql_error() );

print 'Rows Returned: ' . mysql_num_rows( $result );

        if $database->query( ) returns BOOLEAN true or false on success/failure, you may want to try something like

        if( $database->query( $sql ) )
{
	// Proceed to set $_SESSION['cart'][$row['product_id']]
	$row = mysql_fetch_array($result);

// etc

}
else
{
	// Some default Value here
}
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