Help needed with PHP item ordering process

nstephens2k3

Hi everyone, i'm new to PHP Builder as well as PHP in general! I'm currently developing my own PHP 'project' on a made up shop selling football shirts.

I have made a PHP page that displays all football shirts for sale. The football shirt data is being pulled (I hope thats the correct word) from a read file.

In one PHP page, I have created a table with all the football shirts being listed. Beside each football shirt, there is a selection box for the 'user' to select which shirt(s) they want to 'purchase'. At the bottom of the page I have a submit box. Once this submit box is clicked, a new PHP page appears showing which football shirts the 'user' wants to order.

It is on this page that I am having problems. I want to customise this page so that an invoice is created on it. For example, I want to list the selected items on the page and then have a total price of the shirt(s) ordered WITHOUT tax added and then below that a total price WITH tax added.

Below is the code I have for the page that displays all the football shirts available to order:

<html> <head> <title>Football Shirts 'R' Us</title> </head> 
<body>
<body bgcolor="#339900">
<p> <font size=16, color=white><b><u><center>Football Shirts</center></u></b></p>
<form action="url here" method="post">  

<br>
<table width=45%, border=1, align=center>
<tr>
   <th> ID </th>     <th> Football Shirt </th> 
    <th> Team  </th>    <th> Price  </th>    <th> Select  </th> 
</tr>
<tr><tr>
<?php
	if(!($lines = file('read_shirts.txt'))) 
	{echo 'ERROR: Unable to open file! </body></html>'; exit;} 
	foreach($lines as $theline) {
list($id, $shirt, $club, $price) = split('\|',$theline); 
	echo " 
		<tr> 
  		  <td>$id</td>  <td> $shirt </td>
    <td> $club  </td>    <td> $price  </td>    <td><center><input type='checkbox' name='$theline'></center></td>    

	</tr>     "; 
	}
?>
</table>
<form> 
<p><input type="submit" value="Submit">
</form>
<form> 
<input type="reset" value="Reset">
</form>
</body> </html>

Note: where it says <form action="url here" method="post"> i've removed my local URL for the purpose of this thread.

Below is my PHP for the page that appears showing the shirt orders (where i'm having problems customising it):

<html> <head> <title>Football Shirts 'R' Us!</title> </head> 
<body bgcolor="green">
<p> <font size=12, color=white><b><u><center>Your order with Football Shirts 'R' Us</center></u></b></p></font>
<p><font size=6, color=white>Hello, your order is as follows:</p></font>
<table> <tr> </tr>
<?php
$total="0";
foreach ($_POST as $varname => $varvalue) {

if(!($lines = file('read_shirts.txt'))) 
{echo 'ERROR: Unable to open file! </body></html>'; exit;} 

foreach($lines as $theline) 
{
	list($id, $shirt, $club, $price) = split('\|',$theline); 

if ($varname==$varvalue)
{    

echo "
<br/><br/>
<tr>
	<input type='hidden' name='itemcode' value=$id>
	<td><align='center'> Item Number: $id </td>
	<input type='hidden' name='description' value=$shirt>
	<td><align='center'> Item Chosen: $shirt </td>
	<input type='hidden' name='price' value=$club>
	<td><align='center'> Price: $club </td>
	<input type='hidden' name='price' value=$price>
	<td><align='center'> Price: $price </td>
	</tr>";

$total=$total+$price;  

$plusvat=number_format($total*1.175,2); 
}}}

echo "

<br>
<tr> <td aliign='left'> Total Excluding VAT: </td> <td> $total </td> </tr>
<br>
<tr> <td align='left'> Total Including VAT: </td> <td> $plusvat </td> </tr>";

?>
</table> 
</body> </html>

When this page opens I get the following error message:

Your order with Football Shirts 'R' Us

Hello, your order is as follows:



Notice: Undefined variable: plusvat in /public_html/footballshirts/showvariables3.php on line 42

 Total Excluding VAT:  0  

 Total Including VAT:

I appreciate any help anyone could give to a newbie!

Thanks!

NogDog

Most likely you are never satisfying the if($varname == $varvalue) condition, and thus never setting the value of $plusvat. The condition would only be true if one of the $_POST elements had the same exact value for both the index and the value of that element.

nstephens2k3

Sorry, i'm not sure I understand what you mean. Would you be able to explain?

NogDog

Look at this section of code, which I've edited a bit just to change the indenting to make the structure more evident:

foreach ($_POST as $varname => $varvalue) 
{
   if(!($lines = file('read_shirts.txt'))) 
   {
   echo 'ERROR: Unable to open file! </body></html>'; exit;
   } 

   foreach($lines as $theline) 
   {
      list($id, $shirt, $club, $price) = split('\|',$theline); 

  if ($varname==$varvalue)
  {    
     echo "
     <br/><br/>
     <tr>
     <input type='hidden' name='itemcode' value=$id>
     <td><align='center'> Item Number: $id </td>
     <input type='hidden' name='description' value=$shirt>
     <td><align='center'> Item Chosen: $shirt </td>
     <input type='hidden' name='price' value=$club>
     <td><align='center'> Price: $club </td>
     <input type='hidden' name='price' value=$price>
     <td><align='center'> Price: $price </td>
     </tr>";

     $total=$total+$price;  
     $plusvat=number_format($total*1.175,2); 
  }
   }
}

In each iteration of the foreach loop, the value of $varname will be an index from the $_POST array, and $varvalue will be its value. E.g.: if the form element's name is "test" and the value is "example", then the value of $varname will be "test" and the value of $varvalue will be "example".

So, the only way the if condition if ($varname==$varvalue) will be true will be if there is an element in your form where the element's name is the same as its value, e.g.: you assign a name of "example" to a form input element and the user supplies a value of "example". Therefore, unless that rather unusual circumstance occurs, the code within that if block will not be executed. Since I'm not sure what you actually intend for that if condition, I cannot really suggest a solution as I do not know the precise logic you are trying to implement there.

benracer

could you post the file?

nstephens2k3

Yeah sure. Wasn't sure which file you wanted so i've attatched both files for you.

Thanks

benracer

and this one 'read_shirts.txt'

nstephens2k3

Sure.

benracer

did you want a shopping cart or just the items selected to be passed?

nstephens2k3

Just the selected items to be passed onto 'showvariables3.php' page, and displayed in a tabular format like an invoice. I then would like a total price (without VAT) of all the items selected, and then below that a total price of all the items selected with VAT included, and then a submit button which writes to a purchases file.

benracer

This is how to do it in a cart...

addtocart.php

<? 
session_start(); // start the session

$id = $_POST["id"]; // get the id
$price = $_POST["price"]; // get the price

if ( !isset( $_SESSION["cart"] ) ) {  // check if the array is there 
$_SESSION["cart"] = array(); // if not create one
}

$_SESSION["cart"][$id] = $price; // add the data to the array
header("location:showvariables3.php");  // redirect to the cart page
?>

.. the items

<html> <head> <title>Football Shirts 'R' Us</title> </head> 
<body>
<body bgcolor="#339900">
<p> <font size=16, color=white><b><u><center>Football Shirts 'R' Us!</center></u></b></p>
<form action="/showvariables3.php" method="post">  

<br>
<table width=45%, border=1, align=center>
<tr>
   <th> ID </th>     <th> Football Shirt </th> 
    <th> Team  </th>    <th> Price  </th>    <th> Select  </th> 
</tr>
<tr><tr>
<?php
	if(!($lines = file('read_shirts.txt'))) 
	{echo 'ERROR: Unable to open file! </body></html>'; exit;} 
	foreach($lines as $theline) {
list($id, $shirt, $club, $price) = split('\|',$theline); 
?> 
	<tr> 
  		  <td><? echo $id; ?></td>  <td><? echo $shirt ?></td>
    <td><? echo $club ?> </td>  <td>&pound;<? echo $price ?> </td>    <td>
<form method="post" action="addtocart.php" >
  <input name="id" type="hidden" value="<?php echo $id; ?>">
		<input name="price" type="hidden" value="<?php echo $price; ?>">
    		<input type="submit" value="Submit">
</form>
	</td>    

	</tr> 
<?php
}
?>
</table>
</body> </html>

the cart...

<?php
session_start();
$session = $_SESSION['cart'];
$count = count($session);
if($count==0){
echo "No Items In Cart";
}
else {
?>
<html> <head> <title>Football Shirts 'R' Us!</title> </head> 
<body bgcolor="green">
<p> <font size=12, color=white><b><u><center>Your order with Football Shirts 'R' Us</center></u></b></p></font>
<p><font size=6, color=white>Hello, your order is as follows:</p></font>
<table> 
  <tr> </tr>
<?php
foreach ($_SESSION['cart'] as $id => $price ) {
$sub[]=$price;
echo $id;
echo " - ";
echo $price;
echo "<br>";
} 
?>
<br>
<tr> <td aliign='left'> Total Excluding VAT: </td> 
<td nowrap>
&pound;<?php 
$subtotal = array_sum($sub); 
echo number_format($subtotal, 2, '.', ','); 

$total = $subtotal /100 * 17.5 ;  

$total = $total + $subtotal;
$total = round($total, 2);

?> </td> 
</tr>
<br>
<tr> <td align='left'> Total Including VAT: </td> 
<td nowrap>&pound;<? echo number_format($total, 2, '.', ','); ?></td> 
</tr>
</table> 
</body> </html>
<?
}
?>

nstephens2k3

Thanks for this. However there are still a few problems.

I would like a user to select one or more items
When i've selected a shirt and click 'submit' it does appear on the 'addtocart.php' page, however when I click 'back' in the browser, or close it, it still has the orders from last time present. Is there a way you could delete the old shirts orders and stop them from appearing on the page if say the user clicks the back button on their browser, otherwise a long list will appear of shirts that 'other customers' have 'ordered'.

Thanks, I appreciate this a lot!

benracer

the items are stored in a session and only that user can see that particular cart. its built the same way as any usual shopping cart. when you click submit the id and price is saved into a file on the server. The server knows which user the data is to be sent to and from using a unique session id. A session is virtually the same as a cookie, but as these can be disabled by the customer php uses a session and instead of saving the data on to your couputer it uses the server.

benracer

http://www.tizag.com/phpT/phpsessions.php

nstephens2k3

Ah, i see now, thats good. Would you mind doing one more thing for me please and changing the submit buttons on each item to boxes that a user can select, making a user able to select more then one shirt? Many thanks!

benracer

Sure....

benracer

im not exactly sure how i could do this with the session?
Can anybody help 🙂

nstephens2k3

I've spoken to someone else from another forum and they've said:

You can either make the session a multi dimensional array or create more session variables for each item.

Does anyone know how to do this? Thanks

benracer

im nearly there, just got to try and figure how to pass the price as the id's are working. have you got to create a checkout system? also is it necesarry to use the read file and not an sql database?

nstephens2k3

Yeh it is necessary that a read file is used. Well, once items have been selected they need to be displayed on a page (variables3.php) showing the item name, the price without VAT and the price with VAT. then there will be a button at the bottom of the page that says confirm order, this order is then to be recorded on a 'purchases' file. Thanks!