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Zend_View is a class for working with the "view" portion of the model-view-controller pattern. That is, it exists to help keep the view script separate from the model and controller scripts. It provides a system of helpers, output filters, and variable escaping.
Zend_View is template system agnostic; you may use PHP as your template language, or create instances of other template systems and manipulate them within your view script.
Essentially, using Zend_View happens in two major steps: 1. Your controller script creates an instance of Zend_View and assigns variables to that instance. 2. The controller tells the Zend_View to render a particular view, thereby handing control over the view script, which generates the view output.
As a simple example, let us say your controller has a list of book data that it wants to have rendered by a view. The controller script might look something like this:
<?php // use a model to get the data for book authors and titles. $data = array( array( 'author' => 'Hernando de Soto', 'title' => 'The Mystery of Capitalism' ), array( 'author' => 'Henry Hazlitt', 'title' => 'Economics in One Lesson' ), array( 'author' => 'Milton Friedman', 'title' => 'Free to Choose' ) ); // now assign the book data to a Zend_View instance Zend::loadClass('Zend_View'); $view = new Zend_View(); $view->books = $data; // and render a view script called "booklist.php" echo $view->render('booklist.php'); ?>
Now we need the associated view script, "booklist.php". This is a PHP script like any other, with one exception: it executes inside the scope of the Zend_View instance, which means that references to $this point to the Zend_View instance properties and methods. (Variables assigned to the instance by the controller are public properties of the Zend_View instance.) Thus, a very basic view script could look like this:
<?php if ($this->books): ?> <!-- A table of some books. --> <table> <tr> <th>Author</th> <th>Title</th> </tr> <?php foreach ($this->books as $key => $val): ?> <tr> <td><?php echo $this->escape($val['author']) ?></td> <td><?php echo $this->escape($val['title']) ?></td> </tr> <?php endforeach; ?> </table> <?php else: ?> <p>There are no books to display.</p> <?php endif; ?>
Note how we use the "escape()" method to apply output escaping to variables.