WP-PHP: username, email, user ID, total post

USERNAME:
<?php
    $current_user = wp_get_current_user();
    /**
     * @example Safe usage: $current_user = wp_get_current_user();
     * if ( !($current_user instanceof WP_User) )
     *     return;
     */
    echo '<b>' . $current_user->user_login . '</b>';
?>

EMAIL:
<?php
    $current_user = wp_get_current_user();
    /**
     * @example Safe usage: $current_user = wp_get_current_user();
     * if ( !($current_user instanceof WP_User) )
     *     return;
     */
    echo '<b>' . $current_user->user_email . '</b>';
?>

ID USER:
<?php
    $current_user = wp_get_current_user();
    echo '<b>' . $current_user->ID . '</b>';
?>

TOTAL POST:
<?php
$count_posts = wp_count_posts();
echo $count_posts->publish;
?>