我想用它作为一个快捷码，在任何帖子/页面中显示

<?php 
    $user_id = get_current_user_id();
    if ($user_id == 0) {
        echo \'You are currently not logged in.\';
    } else {
        echo \'You are logged in as user \'.$user_id;
    }
?>

// Add Shortcode
function uniqueID_shortcode() {

    $user_id = get_current_user_id();
    if ($user_id == 0) {
        echo \'You are currently not logged in.\';
    } else {
        echo \'You are logged in as user \'.$user_id;
    }

}
add_shortcode( \'naveen\', \'uniqueID_shortcode\' );