Gazelle/sections/schedule/daily/disable_inactive_users.php

<?php
#declare(strict_types=1);

$ENV = ENV::go();

// The SQL query's lines below controls the notification clock
//   AND um.LastAccess < (NOW() - INTERVAL 110 DAY)
//   AND um.LastAccess > (NOW() - INTERVAL 111 DAY)

if (apcu_exists('DBKEY')) {
    // Send email
    $DB->query("
      SELECT um.Username, um.Email
      FROM users_info AS ui
        JOIN users_main AS um ON um.ID = ui.UserID
        LEFT JOIN users_levels AS ul ON ul.UserID = um.ID AND ul.PermissionID = '".CELEB."'
      WHERE um.PermissionID IN ('".USER."', '".MEMBER ."')
        AND um.LastAccess < (NOW() - INTERVAL 355 DAY)
        AND um.LastAccess > (NOW() - INTERVAL 356 DAY)
        AND um.LastAccess IS NOT NULL
        AND ui.Donor = '0'
        AND um.Enabled != '2'
        AND ul.UserID IS NULL
      GROUP BY um.ID");

    while (list($Username, $Email) = $DB->next_record()) {
        $Email = Crypto::decrypt($Email);
        $Body = "Hi $Username,\n\nIt has been almost a year since you used your account at ".site_url().". This is an automated email to inform you that your account will be disabled in 10 days if you do not sign in.";
        Misc::send_email($Email, "Your $ENV->SITE_NAME account is about to be disabled", $Body);
    }

    # The actual deletion clock
    #   AND um.LastAccess < (NOW() - INTERVAL 120 DAY)
    $DB->query("
      SELECT um.ID
      FROM users_info AS ui
        JOIN users_main AS um ON um.ID = ui.UserID
        LEFT JOIN users_levels AS ul ON ul.UserID = um.ID AND ul.PermissionID = '".CELEB."'
      WHERE um.PermissionID IN ('".USER."', '".MEMBER ."')
        AND um.LastAccess < (NOW() - INTERVAL 365 DAY)
        AND um.LastAccess IS NOT NULL
        AND ui.Donor = '0'
        AND um.Enabled != '2'
        AND ul.UserID IS NULL
      GROUP BY um.ID");

    if ($DB->has_results()) {
        Tools::disable_users($DB->collect('ID'), 'Disabled for inactivity.', 3);
    }
}