global $current_user; wp_get_current_user(); ?>
<?php if ( is_user_logged_in() ) {
echo 'Username: ' . $current_user->user_login . "\n"; echo 'User display name: ' . $current_user->display_name . "\n"; }
else { wp_loginout(); } ?>
<?php
$user = get_current_user();
echo $current_user->user_login;
?>