Php prestashop-在选项卡中加载smarty模板

我尝试的是在自定义选项卡上显示模板

这是controllers/admin/AdminTController.php的代码：

<?php
class AdminTController extends ModuleAdminController {

    public function __construct() {
        parent::__construct();
    }

    public function display() {

        //echo $this->l('This is admin my module tab !');
        // the echo works.
        $this->createTemplate('initial.tpl');
    }
}

---

尝试使用下面提到的代码

<?php
class AdminTController extends ModuleAdminController {

    public function __construct() {
        parent::__construct();
    }

    public function display() {
        $tpl = $this->custom_smarty->createTemplate('initial.tpl');
        return $tpl->fetch();
    }
}
?>



<?php
class AdminTController extends ModuleAdminController {

    public function __construct() {
        parent::__construct();
    }

    public function display() {
        $tpl = $this->custom_smarty->createTemplate('initial.tpl');
        return $tpl->fetch();
    }
}
?>