If you will get this issue on magento while printing invoice pdf

Fatal Error: ‘Declaration of Zend_Pdf_FileParserDatasource_File::__contruct() must be compatible with Zend_Pdf_FileParderDatasource::__construct() in /…/lib/Zend/Pdf/FileParserDataSource/File.php

Then here is the simple solution.

Replace

abstract public function __construct();

to

abstract public function __construct($filePath);

in /lib/Zend/Pdf/FileParserDataSource.php