Error while printing invoice in magento

Error while printing invoice

When I open the Sales -> Invoices screen and click on an invoice and then click on the orange Print button in the upper right hand corner of the screen I get the following error message inside the web browser:

Fatal error: Declaration of Zend_Pdf_FileParserDataSource_File::__construct() must be compatible with Zend_Pdf_FileParserDataSource::__construct() in C:\xampp\apps\magento\htdocs\lib\Zend\Pdf\FileParserDataSource\File.php on line 41

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

Fixed it by change in this function lib/Zend/Pdf/FileParserDataSource.php.

change

abstract
public function __construct();

to

abstract
public function __construct($filePath);