Shopping cart that uses xml or .txt

TheJoey · August 27, 2009

could anyone point me at a tutiroul please. ive searched everywere.

ignace · August 27, 2009

ive searched everywere.

first result on Google with an obvious query:

Creating an XML-based shopping cart in PHP:

http://articles.techrepublic.com.com/5100-10878_11-5662732.html

TheJoey · August 27, 2009

i had found that website, but didnt see the links that were inside the body.

thanks

TheJoey · August 27, 2009

Having major issues getting this script to work

home.php

<?php 


require_once("ShoppingCart.php");

$mycart = new Cart("<items/>");

if (isset($_POST["cart"]))
    $mycart = new Cart($_POST["cart"]);

if (isset($_POST["itemId"])) {
    $id = $_POST["itemId"];
    if (isset($mycart->items[$id]))
        $mycart->items[$id] += $_POST["qty"];
    else
        $mycart->add_item($_POST["itemId"], $_POST["qty"]);

}

?>
<html>
<head>
<script language="JavaScript">

function addToCart(id) {
    document.thisForm.itemId.value = id;
    document.thisForm.submit();

}

</script>

</head>

<body>

<form name="thisForm" method="POST">

<ul>

<li>Something old <a href="#" onclick="addToCart(1)">Add To Cart</a> (<? if(isset($mycart->items["1"]))
print $mycart->items["1"]; ?>)</li>

<li>Something new <a href="#" onclick="addToCart(2)">Add To Cart</a> (<? if(isset($mycart->items["2"]))
print $mycart->items["2"]; ?>)</li>

<li>Something borrowed <a href="#" onclick="addToCart(3)">Add To Cart</a> (<? if(isset($mycart

->items["3"])) print $mycart->items["3"]; ?>)</li>

<li>Something blue <a href="#" onclick="addToCart(4)">Add To Cart</a> (<? if(isset($mycart->items["4"]))
print $mycart->items["4"]; ?>)</li>

</ul>

<input type="hidden" name="itemId">

<input type="hidden" name="qty" value="1">

<input type="hidden" name="cart" value="<?=$mycart->xml();?>">

</form>

</body>

</html>

ShoppingCart.php

<?php

class Cart {
    var $items;  // Items collection
    var $parser;
    var $cur_id;
    var $bIsID;
    var $bIsQty;


    function Cart($items_xml) {
        $this->bIsID = false;
        $this->bIsQty = false;
        $this->parser = xml_parser_create();
        xml_set_object(&$this->parser, &$this);
        xml_set_element_handler(&$this->parser, "tag_open", "tag_close");
        xml_set_character_data_handler(&$this->parser, "cdata");
        xml_parse(&$this->parser, $items_xml);
        unset($this->cur_item);
        unset($this->bIsID);
        unset($this->bIsQty);
    }


    function tag_open($pparser, $tag, $attrs) {
        if ($tag == "ID")
            $this->bIsID = true;
        if ($tag == "QTY")
            $this->bIsQty = true;
    }


    function tag_close($pparser, $tag) {
        if ($tag == "ID") $this->bIsID = false;
        if ($tag == "QTY") $this->bIsQty = false;
    }
    
    function cdata($pparser, $data) {
        if ($this->bIsID) $this->cur_id = $data;
        if ($this->bIsQty) $this->items[$this->cur_id] = $data;
    }


    function add_item($id, $qty) {
        $this->items[$id] = $qty;
    }


    function update_qty($id, $qty) {
        $this->add_item($id, $qty);
    }


    function remove_item($id) {
        unset($this->items[$id]);
    }
    
    function xml() {
        $s = "<items>";
        foreach($this->items as $key => $value) {
            $s .= "<item><id>" . $key . "</id><qty>" . $value . "</qty></item>";
        }
        $s .= "</items>";
        return $s;
    }

}
?>

* Something old Add To Cart (items["1"])) print $mycart->items["1"]; ?>)

* Something new Add To Cart (items["2"])) print $mycart->items["2"]; ?>)

* Something borrowed Add To Cart (items["3"])) print $mycart->items["3"]; ?>)

* Something blue Add To Cart (items["4"])) print $mycart->items["4"]; ?>)

im getting that when i try to run it.

ignace · August 27, 2009

xml_set_element_handler(&$this->parser, "tag_open", "tag_close");

should be:

xml_set_element_handler(&$this->parser, array(&$this, "tag_open"), array(&$this, "tag_close"));

same for:

xml_set_character_data_handler(&$this->parser, array(&$this, "cdata"));

RichardRotterdam · August 27, 2009

Before you continue with your xml shopping cart or txt based shopping cart. Is the reason perhaps because you can't use a database such as MySQL or postgres? You might want to look at flatfile databases such as SQLite

TheJoey · August 27, 2009

well its just personal preferences i guess, and my hosting charge for database.

ignace · August 27, 2009

well its just personal preferences i guess, and my hosting charge for database.

They charge extra for a database? Damn find yourself a real host.

RichardRotterdam · August 27, 2009

I mentioned a flatfile database because it's just a file on your server. You shouldn't be charged extra for using a flatfile database if you're server supports it.

TheJoey · August 27, 2009

Yeh my provider are rubbish but ive got it now..

Thanks for the idea dj kat but ive already used some xml in my website already

ive baised the website around using .txt files.

im currently getting this website

And thanks for the quick reply's guys

Parse error: syntax error, unexpected ',', expecting T_PAAMAYIM_NEKUDOTAYIM in C:\xampplite\htdocs\Shopping Cart xml\ShoppingCart.php on line 17

For this code

        xml_set_character_data_handler(&$this->parser, array(&this, "cdata"));

TheJoey · August 27, 2009

Ignore the above post i was missing the $

* Something old Add To Cart (items["1"])) print $mycart->items["1"]; ?>)

* Something new Add To Cart (items["2"])) print $mycart->items["2"]; ?>)

* Something borrowed Add To Cart (items["3"])) print $mycart->items["3"]; ?>)

* Something blue Add To Cart (items["4"])) print $mycart->items["4"]; ?>)

I think this is what is meant to be display but when i try clicking on the links i get nothing

<?php

class Cart {
    var $items;  // Items collection
    var $parser;
    var $cur_id;
    var $bIsID;
    var $bIsQty;


    function Cart($items_xml) {
        $this->bIsID = false;
        $this->bIsQty = false;
        $this->parser = xml_parser_create();
        xml_set_object(&$this->parser, &$this);
        xml_set_element_handler(&$this->parser, array(&$this, "tag_open"), array(&$this, "tag_close"));
        xml_set_character_data_handler(&$this->parser, array(&$this, "cdata"));
        xml_parse(&$this->parser, $items_xml);
        unset($this->cur_item);
        unset($this->bIsID);
        unset($this->bIsQty);
    }


    function tag_open($pparser, $tag, $attrs) {
        if ($tag == "ID")
            $this->bIsID = true;
        if ($tag == "QTY")
            $this->bIsQty = true;
    }


    function tag_close($pparser, $tag) {
        if ($tag == "ID") $this->bIsID = false;
        if ($tag == "QTY") $this->bIsQty = false;
    }
    
    function cdata($pparser, $data) {
        if ($this->bIsID) $this->cur_id = $data;
        if ($this->bIsQty) $this->items[$this->cur_id] = $data;
    }


    function add_item($id, $qty) {
        $this->items[$id] = $qty;
    }


    function update_qty($id, $qty) {
        $this->add_item($id, $qty);
    }


    function remove_item($id) {
        unset($this->items[$id]);
    }
    
    function xml() {
        $s = "<items>";
        foreach($this->items as $key => $value) {
            $s .= "<item><id>" . $key . "</id><qty>" . $value . "</qty></item>";
        }
        $s .= "</items>";
        return $s;
    }

}
?>

<?php 


require_once("ShoppingCart.php");

$mycart = new Cart("<items/>");

if (isset($_POST["cart"]))
    $mycart = new Cart($_POST["cart"]);

if (isset($_POST["itemId"])) {
    $id = $_POST["itemId"];
    if (isset($mycart->items[$id]))
        $mycart->items[$id] += $_POST["qty"];
    else
        $mycart->add_item($_POST["itemId"], $_POST["qty"]);

}

?>
<html>
<head>
<script language="JavaScript">

function addToCart(id) {
    document.thisForm.itemId.value = id;
    document.thisForm.submit();

}

</script>

</head>

<body>

<form name="thisForm" method="POST">

<ul>

<li>Something old <a href="#" onclick="addToCart(1)">Add To Cart</a> (<? if(isset($mycart->items["1"]))
print $mycart->items["1"]; ?>)</li>

<li>Something new <a href="#" onclick="addToCart(2)">Add To Cart</a> (<? if(isset($mycart->items["2"]))
print $mycart->items["2"]; ?>)</li>

<li>Something borrowed <a href="#" onclick="addToCart(3)">Add To Cart</a> (<? if(isset($mycart

->items["3"])) print $mycart->items["3"]; ?>)</li>

<li>Something blue <a href="#" onclick="addToCart(4)">Add To Cart</a> (<? if(isset($mycart->items["4"]))
print $mycart->items["4"]; ?>)</li>

</ul>

<input type="hidden" name="itemId">

<input type="hidden" name="qty" value="1">

<input type="hidden" name="cart" value="<?=$mycart->xml();?>">

</form>

</body>

</html>

Home.php

im still getting this error after fixing it

TheJoey · August 28, 2009

It doesnt seem to be storing to a file or anything.

I dont know what im meant to do.

trq · August 28, 2009

Yeh my provider are rubbish

You get what you pay for, obviously your not willing to pay for a decent host.

Anyway, What error are you getting now?

TheJoey · August 28, 2009

* Something old Add To Cart (items["1"])) print $mycart->items["1"]; ?>)

* Something new Add To Cart (items["2"])) print $mycart->items["2"]; ?>)

* Something borrowed Add To Cart (items["3"])) print $mycart->items["3"]; ?>)

* Something blue Add To Cart (items["4"])) print $mycart->items["4"]; ?>)

that is showing up when i run the code

Where "Add to cart" is a link

but it doesnt do anything.

<?php

class Cart {
    var $items;  // Items collection
    var $parser;
    var $cur_id;
    var $bIsID;
    var $bIsQty;


    function Cart($items_xml) {
        $this->bIsID = false;
        $this->bIsQty = false;
        $this->parser = xml_parser_create();
        xml_set_object(&$this->parser, &$this);
        xml_set_element_handler(&$this->parser, array(&$this, "tag_open"), array(&$this, "tag_close"));
        xml_set_character_data_handler(&$this->parser, array(&$this, "cdata"));
        xml_parse(&$this->parser, &$items_xml);
        unset($this->cur_item);
        unset($this->bIsID);
        unset($this->bIsQty);
    }


    function tag_open($pparser, $tag, $attrs) {
        if ($tag == "ID")
            $this->bIsID = true;
        if ($tag == "QTY")
            $this->bIsQty = true;
    }


    function tag_close($pparser, $tag) {
        if ($tag == "ID") $this->bIsID = false;
        if ($tag == "QTY") $this->bIsQty = false;
    }
    
    function cdata($pparser, $data) {
        if ($this->bIsID) $this->cur_id = $data;
        if ($this->bIsQty) $this->items[$this->cur_id] = $data;
    }


    function add_item($id, $qty) {
        $this->items[$id] = $qty;
    }


    function update_qty($id, $qty) {
        $this->add_item($id, $qty);
    }


    function remove_item($id) {
        unset($this->items[$id]);
    }
    
    function xml() {
        $s = "<items>";
        foreach($this->items as $key => $value) {
            $s .= "<item><id>" . $key . "</id><qty>" . $value . "</qty></item>";
        }
        $s .= "</items>";
        return $s;
    }

}
?>

Shoppingcart.php

<?php 


require_once("ShoppingCart.php");

$mycart = new Cart("<items/>");

if (isset($_POST["cart"]))
    $mycart = new Cart($_POST["cart"]);

if (isset($_POST["itemId"])) {
    $id = $_POST["itemId"];
    if (isset($mycart->items[$id]))
        $mycart->items[$id] += $_POST["qty"];
    else
        $mycart->add_item($_POST["itemId"], $_POST["qty"]);

}
?>
<html>
<head>
<script language="JavaScript">

function addToCart(id) {
    document.thisForm.itemId.value = id;
    document.thisForm.submit();

}

</script>

</head>

<body>

<form name="thisForm" method="POST">

<ul>

<li>Something old <a href="#" onclick="addToCart(1)">Add To Cart</a> (<? if(isset($mycart->items["1"]))
print $mycart->items["1"]; ?>)</li>

<li>Something new <a href="#" onclick="addToCart(2)">Add To Cart</a> (<? if(isset($mycart->items["2"]))
print $mycart->items["2"]; ?>)</li>

<li>Something borrowed <a href="#" onclick="addToCart(3)">Add To Cart</a> (<? if(isset($mycart->items["3"])) 
print $mycart->items["3"]; ?>)</li>

<li>Something blue <a href="#" onclick="addToCart(4)">Add To Cart</a> (<? if(isset($mycart->items["4"]))
print $mycart->items["4"]; ?>)</li>

</ul>

<input type="hidden" name="itemId">

<input type="text" name="qty" value="1">

<input type="hidden" name="cart" value="<?=$mycart->xml();?>">

</form>

</body>

</html>

home.php

trq · August 28, 2009

Use <?php tags not <?

TheJoey · August 28, 2009

Ok thanks for that.

Its now adding 1 to each item, how would i store this information for later use?

For like a checkout or order form.

would i need to use a session start

trq · August 28, 2009

how would i store this information for later use?

You need to write the xml to an xml file.

TheJoey · August 28, 2009

Can i do this threw fwrite or does it require something different?

do you have a tut?

trq · August 28, 2009

You can simply do it through fwrite or file_put_contents.

TheJoey · August 28, 2009

ok ill have a play around with it

ill keep you posted

thanks for your help

TheJoey · August 28, 2009

Is there a way where i can do on click add to file?

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Shopping cart that uses xml or .txt

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