settings.php

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<?php

// checkboxes (on/off)
$bool_settings = [
    'security_protect_upgrade',
    'security_protect_cron',
    'security_disable_password_autocomplete',
    'security_email_require_password',
    'security_email_require_confirmation',
    'security_notify_admins',
    'security_notify_user_admin',
    'security_notify_user_ban',
    'security_notify_user_password',
    'session_bound_entity_icons',
    'subresource_integrity_enabled',
];

foreach ($bool_settings as $setting) {
    elgg_save_config($setting, (bool) get_input($setting));
}

// integer settings
$int_settings = [
    'minusername',
    'min_password_length',
    'min_password_lower',
    'min_password_upper',
    'min_password_number',
    'min_password_special',
];

foreach ($int_settings as $setting) {
    $value = get_input($setting);
    if (elgg_is_empty($value)) {
        // input was left empty ('') so remove config setting
        elgg_remove_config($setting);
    } else {
        elgg_save_config($setting, (int) $value);
    }
}

return elgg_ok_response('', elgg_echo('admin:configuration:success'));