Ron Piggott wrote:
The code I have so far for orders is below. When a product hasn't been
added it does what I want it to --- in giving the message "Your shopping
cart is empty". When a product is added, but then the user changes
their mind I use the following lines of code to remove the selection:
UNSET($_SESSION['order'][$reference]['quantity']);
UNSET($_SESSION['order'][$reference]);
It still leaves the variable $_SESSION['order'] as an array, even if
there are no selections in it. The PHP command is_array is useless of
weed out when there are no products.
What I would like to have happen is if the shopping cart is empty then
the message "Your shopping cart is empty" be displayed 100% of the time.
How do I achieve this? What changes to my code below need to happen?
<?php
if ( isset($_SESSION['order']) ) {
#customer has begun creating order
foreach ($_SESSION['order'] AS $key => $value ) {
echo "Product: " . $key . " Quantity: " .
$_SESSION['order'][$key]['quantity'] . "<br>\r\n";
}
} else {
#no products selected
echo "<ul class=\"lists\">\r\n";
echo "<li>Your shopping cart is empty</li>\r\n";
echo "</ul>\r\n";
}
Try this
<?php
...
if ( isset($_SESSION['order']) && # Does it exist
is_array($_SESSION['order']) && # Is it an array
count($_SESSION['order']) > 0 # Does it have at least 1 element
) {
#customer has begun creating order
foreach ($_SESSION['order'] AS $key => $value ) {
echo "Product: {$key} Quantity: {$_SESSION['order'][$key]['quantity']}<br>\r\n";
}
} else {
#no products selected
echo "<ul class=\"lists\">\r\n";
echo "<li>Your shopping cart is empty</li>\r\n";
echo "</ul>\r\n";
}
...
?>
-----Original Message-----
From: Martin Scotta <martinscotta@xxxxxxxxx>
To: ash@xxxxxxxxxxxxxxxxxxxx
Cc: ron.piggott@xxxxxxxxxxxxxxxxxx, PHP General
<php-general@xxxxxxxxxxxxx>
Subject: Re: Array
Date: Sat, 24 Oct 2009 11:50:14 -0300
On Sat, Oct 24, 2009 at 7:59 AM, Ashley Sheridan
<ash@xxxxxxxxxxxxxxxxxxxx> wrote:
On Sat, 2009-10-24 at 06:57 -0400, Ron Piggott wrote:
> The following line gives me an error message when there aren't
any
> values in the array --- how do I accommodate this?
>
> Warning: Invalid argument supplied for foreach()
>
> foreach ($_SESSION['order'] AS $key => $value ) {
>
>
Do an isset() on $_SESSION['order'] first to determine if the
variable
even exists, then do is_array() to determine if it's an array or
not
before trying to iterate it. My guess is that $_SESSION['order']
isn't
an array all the time.
Thanks,
Ash
http://www.ashleysheridan.co.uk
foreach works with array and instances.
Unless the class implements Transversable, it's public properties are
used on the loop.
foreach($object as $prop => $value )
//php translates the foreach into something like this...
foreach(get_object_vars($object) as $prop => $value )
--
Jim Lucas
"Some men are born to greatness, some achieve greatness,
and some have greatness thrust upon them."
Twelfth Night, Act II, Scene V
by William Shakespeare
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