<?php if ( is_user_logged_in() ) {
echo '{username code here}';
} else {
echo 'Login';
}
?>
<?php global $current_user;
wp_get_current_user();
echo 'Username: ' . $current_user->user_login . "\n";
echo 'User display name: ' . $current_user->display_name . "\n";
?>
[wpforo]