Inpsyde\MultilingualPress\Installation\SystemChecker::check_installation PHP Метод

    public function check_installation()
    {
        if (!$this->is_plugins_page()) {
            return self::WRONG_PAGE_FOR_CHECK;
        }
        $this->check_php_version();
        $this->check_wordpress_version();
        $this->check_multisite();
        $this->check_plugin_activation();
        if (!$this->errors) {
            return self::INSTALLATION_OK;
        }
        $deactivator = new PluginDeactivator($this->plugin_properties->plugin_base_name(), $this->plugin_properties->plugin_name(), $this->errors);
        add_action('admin_notices', [$deactivator, 'deactivate_plugin'], 0);
        add_action('network_admin_notices', [$deactivator, 'deactivate_plugin'], 0);
        return self::PLUGIN_DEACTIVATED;
    }