Restrict access to admin pages

admin-access-restrict.php

<?php defined('ABSPATH') || die('Cheatin&#8217; uh?'); // Cannot access pages directly.

/**
 * Restrict access to admin pages
 * @author Razon Kommar Pal
 */
add_action('admin_init', 'slug_restrict_access_for_specific_path');
function slug_restrict_access_for_specific_path()
{
    $requested_url = $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
    $restrict_paths = ['themes', 'theme-editor', 'plugins', 'plugin-editor', 'plugin-install'];
    if ($restrict_paths) {
        foreach ($restrict_paths as $restrict_path) {
            if (strpos($requested_url, $restrict_path) !== false) {
                wp_die('Keep Silent! you can\'t access here for security reason');
            }
        }
    }
}