CODE EXAMPLE FOR PHP

magento 1.9 print blank page error

you have no any error find then try below code add top in index.php file

ini_set('error_reporting', E_ERROR);
register_shutdown_function("fatal_handler");
function fatal_handler() {
    $error = error_get_last();
    echo("<pre>");
    print_r($error);
}
after check it which line error showing it