Declaration of Zend_Pdf_FileParserDataSource_File::__construct() must be compatible with Zend_Pdf_FileParserDataSource::__construct()

Recently i was printing the pdf from magento admin and i got the following error


Declaration of Zend_Pdf_FileParserDataSource_File::__construct() must be compatible with Zend_Pdf_FileParserDataSource::__construct()

and on searching the issue i have found

This an incompatibility issue between PHP Version 5.4.4 and zend Framwork .

you can fix it by

change in this function lib/Zend/Pdf/FileParserDataSource.php.

change

abstract public function __construct();

to

abstract public function __construct($filePath);

How to use helpers in magento ?

In magento helpers is very useful functionality.Basically we can call helper functions anywhere in the site .

Each module has its own helper function

like in magento you use a below cart helper function to get cart url 

Mage::helper('checkout/cart')->getCartUrl()

the above helper function is created at below location

app/code/core/Mage/Checkout/Helper/Cart.php 

Lets create one new helper function in the end of Cart.php 

let say we need a function in which we need to get all ordered product items data 
 
For this i have create a new function as below

public function getordered_products_data($order_id){
        $cart =  Mage::getModel('sales/order')->load($order_id);
        print_r($cart->getData());die;
        foreach ($cart->getAllItems() as $item) {
        $loadproduct =     Mage::getModel('catalog/product')->load($item->getProduct()->getId());
        print_r($loadproduct->getData());
        }

}

and now we can use this function anywhere in the site as below

Mage::helper('checkout/cart')->getordered_products_data($your_order_id); // pass your order id here

and with this you can see all products data in order anywhere in the site by using above function.

thanks and hope it will help the magento comunity