Problem with __toString

[KevinM1]

I'm still in the process of creating my work's online store.  Since we're small, my boss decided that the design shouldn't be fully automated, so upon checkout, we're sent an e-mail with the order the customer wants, which we then use to contact our distributor in order to fulfill that order (clunky and inefficient, I know...not my choice).  I figured the easiest way to put a person's shopping cart in an e-mail would be to use the __toString magic method.  Unfortunately, I keep getting 'Object id #1' instead of the products in my cart. 

Here's the relevant bits of ShoppingCart code:
[code]
<?

class ShoppingCart{
  private $Cart = array();

  public function addProduct($name, $price, $quantity){
      $this -> Cart[] = new Product($name, $price, $quantity);
  }
.
.
.
public function getTotal(){
      $total = 0;

      foreach($this -> Cart as $value){
        $total += $value -> getPrice();
      }

      return $total;
  }

  public function __toString(){
      $message = NULL;
      $message .= "Name:\tQuantity\tPrice:\n";

      foreach($this -> Cart as $value){
        $message .= "{$value->getName()}\t{$value->getQuan()}\t{$value->getPrice()}\n";
      }

      $message .= "\t\t\t--------\nTotal:\t\t{$this->getTotal()}";
      return $message;
  }
.
.
.
?>
[/code]

And here's my checkout script:
[code]
<?php

#checkout.php

include('../php_config/config.php');
include('../templates/header.inc');

$errMessage = NULL;
$mailMessage = NULL;

if(isset($_POST['submit'])){
  if(!empty($_POST['name']) && preg_match("/^[a-zA-Z]+([ a-zA-Z-]+)*$/i", $_POST['name'])){
      $name = $_POST['name'];
      $n = TRUE;
  }

  else{
      $errMessage .= "Please enter your name!<br />\n";
  }

  if(!empty($_POST['address1']) && preg_match("/^[0-9a-zA-Z\.\-\ ]+$/i", $_POST['address1'])){
      $address1 = $_POST['address1'];
      $a1 = TRUE;
  }

  else{
      $errMessage .= "Please enter your address!<br />\n";
  }

  if(!empty($_POST['address2']) && preg_match("/^[0-9a-zA-Z\.\-\ ]+$/i", $_POST['address2'])){
      $address2 = $_POST['address2'];
  }

  else{
      $address2 = '';
  }

  if(!empty($_POST['city']) && preg_match("/^[a-zA-Z\.\-\ ]+$/i", $_POST['city'])){
      $city = $_POST['city'];
      $c = TRUE;
  }

  else{
      $errMessage .= "Please enter your city!<br />\n";
  }

  if(!empty($_POST['state']) && preg_match("/^[a-zA-Z]{2}$/i", $_POST['state'])){
      $state = $_POST['state'];
      $s = TRUE;
  }

  else{
      $errMessage .= "Please enter your state!<br />\n";
  }

  if(!empty($_POST['zipcode']) && preg_match("/^[0-9]{5}([\-0-9]{4})?$/i", $_POST['zipcode'])){
      $zipcode = $_POST['zipcode'];
      $z = TRUE;
  }

  else{
      $errMessage .= "Please enter your zipcode!<br />\n";
  }

  if($n && $a1 && $c && $s && $z){
      $mailMessage .= "$name\n$address1\n$address2\n$city, $state $zipcode\n\n$myCart";
      mail('[email protected]', 'Test message', $mailMessage);
      echo "Your mail has been sent, $name<br />\n";
  }

  else{
      echo "<div style='color: red;'>$errMessage</div>\n";
  }
}

?>

<form name="checkout" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
  Name: <input type="text" name="name" value="<?php if(isset($_POST['name'])) echo $_POST['name']; ?>" /><br />
  Address 1: <input type="text" name="address1" value="<?php if(isset($_POST['address1'])) echo $_POST['address1']; ?>" /><br />
  Address 2: <input type="text" name="address2" value="<?php if(isset($_POST['address2'])) echo $_POST['address2']; ?>" /><br />
  City: <input type="text" name="city" value="<?php if(isset($_POST['city'])) echo $_POST['city']; ?>" /><br />
  State: <input type="text" name="state" value="<?php if(isset($_POST['state'])) echo $_POST['state']; ?>" /><br />
  Zipcode: <input type="text" name="zipcode" value="<?php if(isset($_POST['zipcode'])) echo $_POST['zipcode']; ?>" /><br />
  <input type="submit" name="submit" value="Checkout" />
</form>

<?php

$_SESSION['myCart'] = NULL;
$_SESSION['ip'] = urlencode(serialize($ip));

ob_end_flush();

?>
[/code]

I'm thinking that the error may have something to do with the cart calling getTotal on itself...my syntax is probably wrong there.  Other than that, though, I'm at a loss as to why it's not working.  Please help.

[KevinM1]

I hate to bump this up, but I still haven't found the solution yet.  Anyone mind helping?  Anyone?  Bueller?

[ToonMariner]

just dump the contents of the $_session['myCart'];

You could loop through that variable and format the output but essentially thats all you need to do.

[Barand]

Your __toString() seems OK. I took your ShoppingCart class, added a Product class and then tried outputting the cart.
[code]
<?php
class Product {
    private $name;
    private $qty;
    private $price;
   
    public function __construct ($n, $q, $p) {
        $this->name = $n;
        $this->qty = $q;
        $this->price = $p;
    }
   
    public function getName ()  {
        return $this->name;
    }
    public function getQuan ()  {
        return $this->qty;
    }
    public function getPrice ()  {
        return $this->price;
    }
}

class ShoppingCart{
  private $Cart = array();

  public function addProduct($name, $price, $quantity){
      $this -> Cart[] = new Product($name, $price, $quantity);
  }

  public function getTotal(){
      $total = 0;

      foreach($this -> Cart as $value){
        $total += $value -> getPrice();
      }

      return $total;
  }

  public function __toString(){
      $message = NULL;
      $message .= "Name:\tQty\tPrice:\n";

      foreach($this -> Cart as $value){
        $message .= "{$value->getName()}\t{$value->getQuan()}\t{$value->getPrice()}\n";
      }

      $message .= "\t\t--------\nTotal:\t\t{$this->getTotal()}";
      return $message;
  }
}

$kart = new ShoppingCart;
$kart->addProduct ('a', 1, 5);
$kart->addProduct ('b', 1, 15);
$kart->addProduct ('c', 2, 8);

echo '<pre>';
echo $kart;
echo '</pre>';

?>
[/code]

This gave -->
[pre]
Name: Qty Price:
a 1 5
b 1 15
c 2 8
--------
Total: 28
[/pre]

EDIT : from the manual

It is worth noting that the __toString method will only be called when it is directly combined with echo() or print().