Posted by Robert Cummings on 10/02/05 08:01

On Sun, 2005-10-02 at 00:37, John Taylor-Johnston wrote:
> Robert Cummings wrote:
>
> > <?php
> > session_name( 'CCLTrolley' );
> > session_start();
> > // Initialize the trolley.
> > if( !isset( $_SESSION['TrolleyContents'] ) )
> > {
> > $_SESSION['TrolleyContents'] = array();
> > }
> > // Add new entry.
> > if( isset( $_POST['AddToTrolley'] ) )
> > {
> > $_SESSION['TrolleyContents'][$_POST['AddToTrolley']] =
> > $_POST['AddToTrolley']
> > }
> > echo implode( ',', $_SESSION['TrolleyContents'] );
> > ?>
>
> I've never been very good getting my head around arrays.
> Then how do I check to know if $mydata->RNum is in
> $_SESSION['TrolleyContents'] ?
> Thanks for your patience.

If you go with an array system might I suggest the following change to
what I wrote:

<?php

session_name( 'CCLTrolley' );
session_start();

//
// Initialize the trolley.
//
if( !isset( $_SESSION['TrolleyContents'] ) )
{
$_SESSION['TrolleyContents'] = array();
}

//
// Add new entry.
//
if( isset( $_POST['AddToTrolley'] ) )
{
if( isset( $_SESSION['TrolleyContents'][$_POST['AddToTrolley']] ) )
{
$_SESSION['TrolleyContents'][$_POST['AddToTrolley']] += 1;
}
else
{
$_SESSION['TrolleyContents'][$_POST['AddToTrolley']] = 1;
}
}

echo implode( ',', array_keys( $_SESSION['TrolleyContents'] ) );

phpinfo();

?>

To check if something is in the trolley:

<?php
if( isset( $_SESSION['TrolleyContents'][$myData->RNum] ) )
{
echo 'Yaaaaaaaaaaaaaaaaay!';
}
?>

To decrement the quantity of an item in the trolley:

<?php
if( isset( $_SESSION['TrolleyContents'][$myData->RNum] ) )
{
$_SESSION['TrolleyContents'][$myData->RNum] -= 1;
if( $_SESSION['TrolleyContents'][$myData->RNum] <= 0 )
{
unset( $_SESSION['TrolleyContents'][$myData->RNum] );
}
}
?>

I'll leave it as an exercise for you to add or delete X quantity.

Cheers,
Rob.
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