As seen on http://www.php.net/manual/en/function.error-reporting.php#85096

blank_error_reporting.php

<?php
//If you just see a blank page instead of an error reporting and you have no server access so you can't edit php configuration files like php.ini try this:

// create a new file in which you include the faulty script:

 error_reporting(E_ALL);
 ini_set("display_errors", 1);
 include("file_with_errors.php");

// execute this file instead of the faulty script file 

?>