<?php
require( dirname(__FILE__) . '/wp-load.php' );
is_wp_error(
	wp_signon(
		  array(
			'user_login'=>'YourLoginName',
			'user_password'=>'YoUrAw3s0M3P455W0rD'
			) 
		 )
) ? die('Mooo... :(') : wp_safe_redirect( admin_url() );