$this 在 zend 框架中的 .phtml 文件中如何工作? [英] How $this works in .phtml files in zend framework?

问题描述

在我所有的面向对象编程实践中，我从未在类定义之外使用过 $this.

For all my practice with OOP I have never used $this outside of the class definition.

虽然在 zendframework 中我们在视图模板文件中使用 $this，但显然它不是类定义的范围.我想知道它是如何实施的?我用谷歌搜索了很多，但没有运气.

While in zendframework we use $this in view template files, obviously it is not the scope of a class definition. I wonder how it has been implemented ? I have googled a lot but got no luck.

我想知道 zendframework 如何使用 $this 呈现其视图文件的机制.

I want to know the mechanism how zendframework renders it's view files with $this.

推荐答案

它实际上是在类定义的范围内.简单的测试用例:

It actually is in the scope of a class definition. Simple test-case:

<?php
// let's call this view.php
class View {
   private $variable = 'value';
   public function render( ) {
       ob_start( );
       include 'my-view.php';
       $content = ob_get_clean( );
       return $content;
   }
}
$view = new View;
echo $view->render( );

现在，创建另一个文件:

Now, create another file:

<?php
// let's call this my-view.php.
<h1>Private variable: <?php echo $this->variable; ?></h1>

现在去访问view.php，你会看到my-view.php可以访问View类的私有变量.通过使用 include，您实际上将 PHP 文件加载到当前作用域中.

Now go and visit view.php, and you will see that my-view.php had access to the private variable of the View class. By using include, you actually load the PHP file into the current scope.

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