What is a Zend View Filter?

Question

What is a Zend View Filter? I see them mentioned in the ZF1 documentation, http://framework.zend.com/manual/1.12/en/zend.view.introduction.html, and in the Zend_View code, but I can't find an explanation for them.

Perhaps it is to support other templating systems which have filters? In that case, what do the filters do in these templating systems?

Thanks!

Answer 1

here is an example of a Zend View Filter:

http://dev.bigace.org/api/3.0/Bigace_Zend/View_Filter/Bigace_Zend_View_Filter_ObfuscateMailto.html

It filters found mailto links and obfuscates them.

A Zend View Filter does something on an already rendered phtml file (= html code) before it is send to the client.

It's a Zend_Filter that can be used on the Zend View output.

Here is another example with code from:

http://www.phpgangsta.de/zend_view-output-filter-whitespaces-aus-html-entfernen

The filter class (filters whitespaces from html = less code to send):

<?php
class App_View_Filter_Minify implements Zend_Filter_Interface
{
    public function filter($string)
    {
        return preg_replace(
            array('/>\s+/', '/\s+</', '/[\r\n]+/'),
            array('>', '<', ' '),
            $string
        );
    }
}

And then adding the filter to the view:

/**
 * Add Output filters to View
 *
 * @return void
 */
protected function _initViewFilter()
{
    $view = $this->getResource('view');
    $view->addFilterPath('App/View/Filter', 'App_View_Filter_')
        ->addFilter('Minify');
}