[SOLVED] PHP shopping cart that uses arrays?

TheJoey · September 7, 2009

ive seen a few examples on the net but seem very complex, what would be the easiest way to start a shopping cart that stores its data in arrays insted of a database.

RichardRotterdam · September 7, 2009

ive seen a few examples on the net but seem very complex, what would be the easiest way to start a shopping cart that stores its data in arrays insted of a database.

A shoppingcart that uses arrays instead of a database doesn't even exist.

dave_sticky · September 7, 2009

Sessions and Arrays...

session_start();

$_SESSION['shopping_cart'] = array();

// And then to add items...

$_SESSION['shopping_cart'][] = "Item 1";

$_SESSION['shopping_cart'][] = "Item 2";

// And to echo them back out...

foreach($_SESSION['shopping_cart'] as $value) {
  echo $value . "<br />";
}

TheJoey · September 7, 2009

if i was to use

session_start();

$_SESSION['shopping_cart'] = array();

// And then to add items...

$_SESSION['shopping_cart'][] = "Item 1";

$_SESSION['shopping_cart'][] = "Item 2";

// And to echo them back out...

foreach($_SESSION['shopping_cart'] as $value) {
  echo $value . "<br />";
}

would i then be able to edit add and remove from cart?

or would it be restricted

dave_sticky · September 7, 2009

Well you could add to it by having a "Add To Cart Link" which could pass the item to a script in the URL...

<a href='<?PHP echo $_SERVER['REQUEST_URI']; ?>&action=add_to_cart&item=ItemName'>Add To Cart Link</a>

if($_GET['action'] == "add_to_cart") {
  $_SESSION['shopping_cart'][] = $_GET['item'];
}

Remove is a little more tricky, but you'd need a remove link next to each item in the cart...

foreach($_SESSION['shopping_cart'] as $key => $value) {
echo $value . "<a href='" . $_SERVER['REQUEST_URI'] . "&action=remove_item&itemkey=" . $key ."'>Remove</a>";
}

if($_GET['action'] == "remove_item") {
unset($_SESSION['shopping_cart'][$_GET['itemkey']]);
}

This is all just off the top of my head, I've not tested it. But it's the basics of what you need to make it work!

TheJoey · September 7, 2009

ill keep u posted its really late .

thanks for your help.

TheJoey · September 8, 2009

When i try to use one of the href from the links i get this error

ERROR 403

Access forbidden

thewooleymammoth · September 8, 2009

your gonna have to use databases or files at one point or another, another, but here is one that i wrote a while ago, you can look at if you want. it uses arrays to keep track of items in the cart, but uses a database to keep track of items available for purchase.

cart page

<?php
defined("pc") or die("no direct access allowed");
$con=mysql_connect(host, sql_user, sql_pass);
        mysql_select_db(db);
    if(isset($_GET['addproductid']))
    {
        $id=mysql_real_escape_string($_GET['addproductid']);
        if(isset($_GET['qty']))
        {
            $qty=mysql_real_escape_string(strip_tags(htmlspecialchars($_GET['qty'])));
            $sql="SELECT * FROM `shop_products` WHERE `id` = '$id' LIMIT 1;";
            $product=mysql_fetch_assoc(mysql_query($sql));
            $views=$product['views'];
            $purchased=$product['times_purchased'];
            if($purchased < 1)
            {
                $purchased=1;
            }
            $purchased=$purchased + $qty;
            $rating=$views * $purchased;
            $sql="UPDATE `shop_products` SET `times_purchased` = '$purchased', `rating` = '$rating' WHERE `id` = '$id' LIMIT 1";
            mysql_query($sql);

        }
        else
        {
          $qty=1;
        }
        if(isset($_SESSION['cart']["$id"]))
        {
          $old=explode(' ', $_SESSION['cart']["$id"]);
          $oldqty=$old['1'];
          $newqty=$oldqty + $qty;
          $_SESSION['cart']["$id"]="$id $newqty";
        }
        else
        {
          $_SESSION['cart']["$id"]="$id $qty";
        }
    }
    elseif(isset($_POST['updateqty']))
    {
        if(isset($_SESSION['cart']["$id"]))
        {
          unset($_SESSION['cart']["$id"]);
        }
        $id=$_POST['updateqtyid'];
        $qty=$_POST['updateqty'];
        $_SESSION['cart']["$id"]="$id $qty";
    }
    elseif(isset($_GET['remove']))
    {
        $id=mysql_real_escape_string($_GET['remove']);
        if(isset($_SESSION['cart']["$id"]))
        {
          unset($_SESSION['cart']["$id"]);
        }
        echo "
        <div id='message'>
        Item removed
        </div>
        ";
    }
    echo "
    <div id='cartmain'>
    ";
    if(is_array($_SESSION['cart']) && count($_SESSION['cart']) > 0)
    {
        echo"<table id='carttable' width='80%'>
            <tr class='demo' valign='top'>
                <td width='30%'>
                    <b>Quantity</b><br /><br />
                </td>
                <td width='40%' >
                    <b>Product Name</b>
                </td>
                <td width='10%' align='right'>
                    <b>Price</b>
                </td>
                <td width='30%' align='right'>
                <b>Item Total</b>
                </td>
            </tr>
                ";
                $total=0;
        foreach($_SESSION['cart'] as $product)
        {
            $product=explode(" ", $product);
            $id=$product[0];
            $qty=$product[1];
            $sql="SELECT * FROM `shop_products` WHERE `id` = '$id' LIMIT 1;";
            $product=mysql_fetch_array(mysql_query($sql));
            $name=htmlspecialchars(stripslashes($product['name']));
            $price=$product['price'];
            $pricee=number_format($product['price'], 2);
            $subtotal=$price * $qty;
            $subtotale=number_format($subtotal, 2);
            $subtotalp=str_replace(",", "", $subtotal);
            $total = $total + $subtotal;
            $totale=number_format($total, 2);
            echo "
            <tr valign='top'>
                <td>
                    <form method='post' action='?viewcart'>
                    <input type='hidden' name='updateqtyid' value='$id' />
                    <input type='text' name='updateqty' size='2' value='$qty' />
                    <input type='submit' value='update' /><br />
                    <a href='?viewcart&remove=$id'>Remove</a><br />
                    </form>

                </td>
                <td>
                    <a href='?product&productid=$id'>$name</a>
                </td>
                <td align='right'>
                    $".$pricee."
                </td>
                <td align='right'>
                $".$subtotale."
                </td>
            </tr>
            ";
        }
        echo "
        <tr>
            <td>
            </td>
            <td>
            </td>
            <td align='right'>
            <b>Sub-Total:</b>
            </td>
            <td align='right'>
        $".$totale."
            </td>
        </tr>
        </table>
        ";
        $pageurl=page_url();
        $pageurl=explode("?", $pageurl);
        $pageurlreturn=$pageurl[0] . "?return";
        $pageurlconfirm=$pageurl[0] . "?confirm";
        $_SESSION['total']=$total;
        echo "<form action='https://www.paypal.com/cgi-bin/webscr' method='post'>
                            <input type='hidden' name='cmd' value='_xclick'>
                            <input type='hidden' name='upload' value='1'>
                            <input type='hidden' name='business' value='*youremail here'>
                            <input type='hidden' name='item_name' value='Miners_Cart_Checkout'>
                            <input type='hidden' name='amount' value='$total'>
                            <input type='hidden' name='quantity' value='1'>
                            <input type='hidden' name='notify_url' value='$pageurlconfirm'>
                            <INPUT TYPE='hidden' name='return' value='$pageurlreturn'>
                            <input type='submit' value='Checkout'>
                            </form>
        ";

    }
    else
    {
        echo "
        You have no items in your cart
        ";
    }
    echo "<a href='?'>Continue Shopping?</a>";
    echo"</div>";
mysql_close($con);



?>

browse page

<?php
defined("pc") or die("no direct access allowed");
    $con=mysql_connect(host, sql_user, sql_pass);
    mysql_select_db(db);

        $sql="SELECT * FROM `shop_products`";
        if(isset($_GET['sort']))
        {
          $sort=mysql_real_escape_string($_GET['sort']);
          $sql.= " ORDER BY `$sort` ASC";
        }
    $query=mysql_query($sql);
    echo "
    <table width='600px' id='browse_table' >
            <tr>
                <td width='80%'>
                Name:
                </td>
                <td width='20%'>
                Price
                </td>
            </tr>";
    while($q = mysql_fetch_assoc($query))
    {
           $name=stripslashes($q['name']);
           $id=$q['id'];
           $price=number_format($q['price'], 2);
           $image=$q['image'];
           echo "
           <tr><td><a href='?product&productid=$id'>$name</a></li></td><td>$".$price."</td></tr> <br />
           ";
    }
    echo "
    </table>
    ";
    mysql_close($con);

?>

the page for a single item

<?php
defined("pc") or die("no direct access allowed");
    require_once($_SERVER['DOCUMENT_ROOT'].install."/scripts/shop/functions.php");

    $con=mysql_connect(host, sql_user, sql_pass);
    mysql_select_db(db);
    if(isset($_GET['productid']))
    {
        $id=mysql_real_escape_string($_GET['productid']);
        $sql="SELECT * FROM `shop_products` WHERE `id` = '$id' LIMIT 1;";
        $product=mysql_fetch_assoc(mysql_query($sql));
        $views=$product['views'];
        $views++;
        $purchased=$product['times_purchased'];
        if($purchased < 1)
        {
          $purchased=1;
        }
        $rating=$views * $purchased;
        $sql="UPDATE `shop_products` SET `views` = '$views', `rating` = '$rating' WHERE `id` = '$id' LIMIT 1";
        mysql_query($sql);
        $name=htmlspecialchars(stripslashes($product['name']));
        $des=stripslashes($product['description']);
        $price=$product['price'];
        $img=$product['image'];
        echo "<h3>$name</h3>";

        echo "
        <div style='width:600px;'>
            <table valign='top'>
            <tr>
            <td>
                <img src='$img' width='250'  />
            </td>
            <td valign='top'>";
            echo "$".$price;
            add_to_cart($id);
            echo "
            </td>
            </tr>
            </table>
        $des
        </div>
        ";

    }
    else
    {
      echo "
      <div id='message'>
        You must have a product id.
      </div>
      ";
    }

    mysql_close($con);
?>

and the page for functions

<?php
defined("pc") or die("no direct access allowed");
    function add_to_cart($id)
    {
        echo "
        <form method='get'>
            <input type='hidden' value='view' name='viewcart' />
            Quantity: <input type='text' name='qty' value='1' size='3' />
            <input type='hidden' name='addproductid' value='$id' /> <br />
            <INPUT TYPE='image' SRC='' HEIGHT='40'  BORDER='0' ALT='Submit Form'>
        </form>
        ";
    }

?>

and you would need a page that allows people create items, but i dont feel that that is really relavant to this question.

I wouldnt use any of this code becuase its not finished and i know there are several flaws and security issues, but if you want to analyze it and see how it works go for it. Also you can find the whole thing here http://dev.bytecannon.net however that site is what i use to create all of the scripts and its not quite ready for launch. so i wouldnt use any of the scripts in there.

TheJoey · September 8, 2009

couldnt a use of a flat file database be used, cause i cant use mysql on my hosting..

dave_sticky · September 8, 2009

Yep, flat-file could be used if needed. Bit more complicated to set up and access though.

TheJoey · September 8, 2009

guess ill give it a shot

TheJoey · September 8, 2009

Well i thought i could start by producing the arrays

would i then be able to use this code

<?php

//These bunch of arrays act as a database.

$categories=array();
$categories[]='Socks';
$categories[]='Shoes';
$catergories[]='Ball';

$products=array();

$products['item1']['category']='socks1';
$products['item1']['sizes']='0,1,2,3,4';
$products['item1']['price']='2';

$products['item1']['category']='shoe1';
$products['item1']['sizes']='0,1,2,3,4';
$products['item1']['price']='3';

$products['item1']['category']='ball1';
$products['item1']['sizes']='0,1,2,3,4';
$products['item1']['price']='4';

?>

to act as a database?

dave_sticky · September 8, 2009

Theoretically yes, you could do it like this, but this will put a lot of processing on each page... Particularly if you've got a large shop - every time a page loads, the whole shop will load (behind the scenes) just to pull out the one item that needs to appear on the page.

TheJoey · September 8, 2009

i have absolute no idea how to do it.

well there is going to be about 6 items. The only problem is that i can write a database driven shopping cart.

But get completly stuck when using arrays this way.

Do you have a different way it can be done?

dave_sticky · September 8, 2009

Well as it is only 6 items, and in the absence of MySQL, I'd probably go with a static page for each item, and the code (or a modification of it) that I posted yesterday for the shopping cart. It would be by far the quickest way of implementing it. It will of course mean that it isn't very scalable - a new item would require a new file.

Or alternately, get a server with MySQL on it!

TheJoey · September 8, 2009

Thanks for your help dave, ill keep you posted.

So you think i shouldnt store my arrays like i have and just do it the way you have correct

?

ill give it a go!

cheers

dave_sticky · September 8, 2009

Well it's up to you, but personally I would use static pages to do it...

Good luck with it!

TheJoey · September 8, 2009

<a href='<?PHP echo $_SERVER['REQUEST_URI']; ?>&action=add_to_cart&item=ItemName'>Add To Cart Link</a>

im having problems with this line of code.

Do i have to define Item?

as the items i have stored?

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');

session_start();

$_SESSION['shopping_cart'] = array();

// And then to add items...

$_SESSION['shopping_cart'][] = "Ball";

$_SESSION['shopping_cart'][] = "Shoe";

// And to echo them back out...

foreach($_SESSION['shopping_cart'] as $value) {
  echo $value . "<br />";
}

?>
<html>
<head>
</head>
<body>
<a href='<?PHP echo $_SERVER['REQUEST_URI']; ?>&action=add_to_cart&item=Ball'>Add To Cart Link</a>
</body>
<?php
if($_GET['action'] == "add_to_cart") {
  $_SESSION['shopping_cart'][] = $_GET['item'];
}
?>
<?php
foreach($_SESSION['shopping_cart'] as $key => $value) {
echo $value . "<a href='" . $_SERVER['REQUEST_URI'] . "&action=remove_item&itemkey=" . $key ."'>Remove</a>";
}

if($_GET['action'] == "remove_item") {
unset($_SESSION['shopping_cart'][$_GET['itemkey']]);
}
?>

dave_sticky · September 8, 2009

Um... I don't know what your URL looks like, but if you're not using dynamic URLs (like index.php?page=page1 (or whatever)) you'll want to change the first & to a question mark

<a href='<?PHP echo $_SERVER['REQUEST_URI']; ?>?action=add_to_cart&item=Ball'>Add To Cart Link</a>

When you say "problems"... does it give you an error message?

TheJoey · September 8, 2009

the problem is that when i click the link i get

Object not found!

TheJoey · September 8, 2009

never mind the ? fixed the issue.

Just gotta play around with what i got.

Thanks for your help dave your a legend man.

dave_sticky · September 8, 2009

Ok, no probs mate. Glad to be of help.

By the way, I was just tinkering with it on my local server... Probably best to use $_SERVER['PHP_SELF'] and not $_SERVER['REQUEST_URI'] if you're not using dynamic URLs... Otherwise you'll wind up with a very long url very quickly.

If you are using dynamic URLs, you'll need to find some way of cleaning the link before echoing it out.

dave_sticky · September 8, 2009

By the way, unless you've spotted this problem already you're going to have a whole world of issues with the shopping cart emptying / adding things to itself every time the page reloads. I'm going offline for the day soon, so if you get stuck, this should help:

<?php

error_reporting(E_ALL);
ini_set('display_errors', '1');

session_start();

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

// And then to add items...

// $_SESSION['shopping_cart'][] = "Ball";

// $_SESSION['shopping_cart'][] = "Shoe";

// Adding to Cart:
if(isset($_GET['action']) && $_GET['action'] == "add_to_cart") {
  $_SESSION['shopping_cart'][] = $_GET['item'];
}

// Removing From Cart:
if(isset($_GET['action']) && $_GET['action'] == "remove_item") {
  unset($_SESSION['shopping_cart'][$_GET['itemkey']]);
}


?>
<html>
<head>
</head>
<body>

<?PHP
  
  echo "<b>Shopping Cart</b><br />";
  
  foreach($_SESSION['shopping_cart'] as $key => $value) {
echo $value . " <a href='" . $_SERVER['PHP_SELF'] . "?action=remove_item&itemkey=" . $key ."'>Remove</a><br />";
  }
  
?>

<br />
<br />

<a href='<?PHP echo $_SERVER['PHP_SELF']; ?>?action=add_to_cart&item=Ball'>Add Ball to Cart</a><br />
<a href='<?PHP echo $_SERVER['PHP_SELF']; ?>?action=add_to_cart&item=Shoe'>Add Shoes to Cart</a>

</body>
</html>

TheJoey · September 10, 2009

yeah i was having a world of trouble with the session and url.

thanks dave.

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[SOLVED] PHP shopping cart that uses arrays?

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