PHP Arrays

[TheJoey]

i was playing around with this simple array shopping cart,

i seem to have hit a snag because i cant call up the same class .

class ShoppingCart {

Line 38

Fatal error: Cannot redeclare class ShoppingCart in C:\xampplite\htdocs\Trial\new2.php on line 38

 

 <?php

class ShoppingCart {

    var $items;

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

    function show_cart()
    {
       return $this->items;
    }

}

$cart = new ShoppingCart;

$cart->add_items("Apples", 5);
$cart->add_items("Oranges", 15);
$cart->add_items("Peaches", 17);

$cart_items = $cart->show_cart();

foreach($cart_items as $key => $value)
{
    echo "Item name = $key; Item quantity: $value <br>";
}

?>

After adding the items and getting an array that can be used to display them, we quickly add two more functions to remove the items from the shopping cart, and modify the quantity.

<?php

class ShoppingCart {

    var $items;

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

    function update_items($product_id, $qty)
    {
       if(array_key_exists($product_id, $this->items))
       {
          if($this->items[$product_id]>$qty)
          {
             $this->items[$product_id]-=($this->items[$product_id]-$qty);
          }
          if($this->items[product_id]<$qty)
          {
             $this->items[$product_id]+=abs($this->items[$product_id]-$qty);
          }
          if($qty==0)
          {
             unset($this->items[product_id]);
          }
       }
    }
   
    function remove_item($product_id)
    {
       if(array_key_exists($product_id, $this->items))
       {
          unset($this->items[$product_id]);
       }
    }

    function show_cart()
    {
       return $this->items;
    }

}

$cart = new ShoppingCart;

$cart->add_items("Apples", 5);
$cart->add_items("Oranges", 15);
$cart->add_items("Peaches", 17);

$cart_items = $cart->show_cart();

foreach($cart_items as $key => $value)
{
    echo "Item name = $key; Item quantity: $value <br>";
}

$cart->update_items("Peaches", 28);
$cart->update_items("Oranges", 7);
$cart_items=$cart->show_cart();

echo "================<br>";

foreach($cart_items as $key=>$value)
{
    echo "$key = $value<br>";
}

$cart->remove_item("Oranges");
$cart_items=$cart->show_cart();

echo "================<br>";

foreach($cart_items as $key=>$value)
{
    echo "$key = $value<br>";
}


?> 

rest of code

[Prismatic]

Remove the first instance of ShoppingCart.

 

<?php
$cart = new ShoppingCart;

$cart->add_items("Apples", 5);
$cart->add_items("Oranges", 15);
$cart->add_items("Peaches", 17);

$cart_items = $cart->show_cart();

foreach($cart_items as $key => $value)
{
    echo "Item name = $key; Item quantity: $value <br>";
}

?>

After adding the items and getting an array that can be used to display them, we quickly add two more functions to remove the items from the shopping cart, and modify the quantity.

<?php

class ShoppingCart {

    var $items;

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

    function update_items($product_id, $qty)
    {
       if(array_key_exists($product_id, $this->items))
       {
          if($this->items[$product_id]>$qty)
          {
             $this->items[$product_id]-=($this->items[$product_id]-$qty);
          }
          if($this->items[product_id]<$qty)
          {
             $this->items[$product_id]+=abs($this->items[$product_id]-$qty);
          }
          if($qty==0)
          {
             unset($this->items[product_id]);
          }
       }
    }
   
    function remove_item($product_id)
    {
       if(array_key_exists($product_id, $this->items))
       {
          unset($this->items[$product_id]);
       }
    }

    function show_cart()
    {
       return $this->items;
    }

}

$cart = new ShoppingCart;

$cart->add_items("Apples", 5);
$cart->add_items("Oranges", 15);
$cart->add_items("Peaches", 17);

$cart_items = $cart->show_cart();

foreach($cart_items as $key => $value)
{
    echo "Item name = $key; Item quantity: $value <br>";
}

$cart->update_items("Peaches", 28);
$cart->update_items("Oranges", 7);
$cart_items=$cart->show_cart();

echo "================<br>";

foreach($cart_items as $key=>$value)
{
    echo "$key = $value<br>";
}

$cart->remove_item("Oranges");
$cart_items=$cart->show_cart();

echo "================<br>";

foreach($cart_items as $key=>$value)
{
    echo "$key = $value<br>";
}


?> 

[TheJoey]

The code isnt working at all now its just being displayed at

add_items("Apples", 5); $cart->add_items("Oranges", 15); $cart->add_items("Peaches", 17); $cart_items = $cart->show_cart(); foreach($cart_items as $key => $value) { echo "Item name = $key; Item quantity: $value
"; } ?> After adding the items and getting an array that can be used to display them, we quickly add two more functions to remove the items from the shopping cart, and modify the quantity. items[$product_id]=$qty; } function update_items($product_id, $qty) { if(array_key_exists($product_id, $this->items)) { if($this->items[$product_id]>$qty) { $this->items[$product_id]-=($this->items[$product_id]-$qty); } if($this->items[product_id]<$qty) { $this->items[$product_id]+=abs($this->items[$product_id]-$qty); } if($qty==0) { unset($this->items[product_id]); } } } function remove_item($product_id) { if(array_key_exists($product_id, $this->items)) { unset($this->items[$product_id]); } } function show_cart() { return $this->items; } } $cart = new ShoppingCart; $cart->add_items("Apples", 5); $cart->add_items("Oranges", 15); $cart->add_items("Peaches", 17); $cart_items = $cart->show_cart(); foreach($cart_items as $key => $value) { echo "Item name = $key; Item quantity: $value
"; } $cart->update_items("Peaches", 28); $cart->update_items("Oranges", 7); $cart_items=$cart->show_cart(); echo "================
"; foreach($cart_items as $key=>$value) { echo "$key = $value
"; } $cart->remove_item("Oranges"); $cart_items=$cart->show_cart(); echo "================
"; foreach($cart_items as $key=>$value) { echo "$key = $value
"; } ?> 

[Batosi]

You have to declare your class before you call it so place the full class above it then call it below. Just switch things around but dont try to declare it twice.

[TheJoey]

im unsure how i would apply it.

Sorry but im quiet new and ive had no major problems with php untill running into this shopping cart

[Prismatic]

You have to declare your class before you call it so place the full class above it then call it below. Just switch things around but dont try to declare it twice.

 

Not true.

 

<?php
$world = new Hello;
$world->say();

class Hello
{
    public function say()
    {
        print "Hello World!";
    }
}
?>

 

Output

Hello World!

[TheJoey]

So what is it that i am doing wrong with this class.

[trq]

Your defining it twice.

[TheJoey]

So insted of using Class "classname" just use the "classname"

[trq]

You cannot define the same class twice, same as you cannot define the same function twice.eg;

 

class foo
{
// contents
}
class foo
{
// contents
}

 

Will cause an error.

[emehrkay]

You cannot define the same class twice, same as you cannot define the same function twice.eg;

 

 

Why is this thread so long?