Re: session_name("CCLTrolley")

[Robert Cummings <robert@xxxxxxxxxxxxx>]

On Sun, 2005-10-02 at 01:01, Robert Cummings wrote:
>
> If you go with an array system might I suggest the following change to
> what I wrote:

I'm resending a better way to do the simple trolley since you seemed to
have created a Frankensteinian merge of the two examples I sent
previously. This version uses functions which should probably be put
into their own source file and included (let's call it lib.trolley.php).

<?php

session_name( 'CCLTrolley' );
session_start();

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

function trolleyItemQuantity( $itemId )
{
    $trolley = &$_SESSION['TrolleyContents'];

    //
    // Return the $quantity of $item in the $trolley.
    //
    if( isset( $trolley[$item] ) )
    {
        return $trolley[$item];
    }

    return 0;
}

function trolleyItemExists( $itemId, $quantity )
{
    $trolley = &$_SESSION['TrolleyContents'];

    //
    // Return true if $item is in the $trolley; otherwise return false.
    //
    if( isset( $trolley[$item] ) )
    {
        return $trolley[$item];
    }

    return 0;
}

function trolleyItemAdd( $itemId, $quantity )
{
    $trolley = &$_SESSION['TrolleyContents'];

    //
    // Add $quantity of $item to the $trolley.
    //
    if( isset( $trolley[$item] ) )
    {
        $trolley[$item] += $quantity;
    }
    else
    {
        $trolley[$item] = $quantity;
    }
}

function trolleyItemRemove( $itemId, $quantity )
{
    $trolley = &$_SESSION['TrolleyContents'];

    //
    // Remove $quantity of $item from the $trolley.
    //
    if( isset( $trolley[$item] ) )
    {
        $trolley[$item] -= $quantity;

        if( $trolley[$item] < 1 )
        {
            unset( $trolley[$item] );
        }
    }
}

function trolleyPrint()
{
    //
    // Display the trolley.
    //

    echo "<pre>\n"
        .implode( ',', array_keys( $_SESSION['TrolleyContents'] ) )
        ."\n</pre>\n";
}

?>

Now the following would facilitate the action you appear to be
performing in your example for adding to the trolley:

<?php

include_once( 'lib.trolley.php' );

if( isset( $_POST['ShopAction'] ) && isset( $_POST['RNum'] ) )
{
    echo $_POST['ShopAction'].'!!<br />';

    if( 'add' == $_POST['ShopAction'] )
    {
        echo 'Adding '.$_POST['RNum'].'...<br />';

        trolleyItemAdd( $_POST['RNum'], 1 );
    }
    else
    if( 'delete' == $_POST['ShopAction'] )
    {
        echo 'Deleting '.$_POST['RNum'].'...<br />';

        trolleyItemRemove( $_POST['RNum'], 1 );
    }
}
else
{
    echo 'No action specified!!<br />';
}

trolleyPrint();

?>

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