gistfile1.php

<?php
global $current_user;

(is_object($current_user) && isset($current_user->user_login)) ? $html = '<input type="hidden" name="current_user" value="' . $current_user->user_login . '" />' : $html = '' ;

$html. = '<input type="submit" value="' . esc_attr( $value ) . '"' . $atts . ' />';