Interface not found

[drogo]

Hi

 

Could someone give me some advice please.

 

I'm playing around with interfaces and OOP PHP and I've set up an interface class and a class which implements it however when I run the script form the browser on my local server I get the following error:

 

"Fatal error: Interface 'Chargeable' not found in C:\wamp\www\oop\class_ShopProduct.php on line 4"

 

Here are the two classes:

 

interface Chargeable

{

public function getPrice();

}

 

class ShopProduct implements Chargeable

{

public function getPrice()

{

return 23;

}

}

 

and the client code:

 

include_once('./class_ShopProduct.php');

$np = new ShopProduct;

echo $price = $np->getPrice();

 

I'm running Windows 7 with WAMP server 2.0 (PHP 5.3.0 & Apache 2.2.11)

 

Any help would be appreciated as I can't work out how it's not working when it seems like it should.

 

[rajivgonsalves]

where are you including the interface is it in the class file

[drogo]

no its in another file in the same folder called "interface.php":

<?php

include_once('./class_ShopProduct.php');

$np = new ShopProduct;

echo $price = $np->getPrice();

?>

[rajivgonsalves]

your code should be then

 

<?php
include_once('./interface.php');
include_once('./class_ShopProduct.php');
$np = new ShopProduct;
echo $price = $np->getPrice();
?>

[drogo]

thanks that works 

[ignace]

I disagree it should be:

 

require_once('Chargeable.php');

class ShopProduct implements Chargeable
{
   public function getPrice()
   {
      return 23;
   }
}

 

Otherwise he will have to add include_once('interface.php'); everytime he wants to use the ShopProduct class