php - View variable is not accessible in template

Question

in my PagesController::display() i have this code :

class PagesController extends AppController {

    public function display(...$path) {
        $count = count($path);
        if (!$count) {
            return $this->redirect('/');
        }
        if (in_array('..', $path, true) || in_array('.', $path, true)) {
            throw new ForbiddenException();
        }
        $page = $subpage = null;

        if (!empty($path[0])) {
            $page = $path[0];
        }
        if (!empty($path[1])) {
            $subpage = $path[1];
        }
        $this->set(compact('page', 'subpage'));

        try {
            $this->render(implode('/', $path));
        } catch (MissingTemplateException $exception) {
            if (Configure::read('debug')) {
                throw $exception;
            }
            throw new NotFoundException();
        }
        $test = "abc";
        $this->set(compact('test'));
    }
}

That's almost the same as the standard pages controller, I added the last two lines.

My home.ctp template contains:

<?php
var_dump($test);
...

When I access the site, this outputs:

C:\wamp64\www\site\src\Template\Pages\home.ctp:322:null

Which is confusing because debug kit shows that this variable was set:

Why is the test variable not available in the home.ctp template?

Answer 1

在设置之前调用渲染

   try {
        $this->render(implode('/', $path)); <----
    } catch (MissingTemplateException $exception) {
        if (Configure::read('debug')) {
            throw $exception;
        }
        throw new NotFoundException();
    }
    $test = "abc";
    $this->set(compact('test')); <-----
}

调用 set 为时已晚 - 这是在模板已经使用之后。

要产生任何效果， set 调用必须在调用 render 之前，即：

$test = 'abc';
$this->set(compact('page', 'subpage', 'test')); <---

try {
    $this->render(implode('/', $path)); <---
...

为什么变量会出现在 DebugKit 中？

DebugKit 询问控制器实例以获取使用的视图变量——但这会在请求结束时运行。这就是调试工具包找到它的原因，即使它在模板中不可用。