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Basic usage of filters

Having this filter definition established provides the foundation for Zend_Filter_Interface, which requires a single method named filter() to be implemented by a filter class.

Following is a basic example of using a filter upon two input data, the ampersand (&) and double quote (") characters:

= new Zend_Filter_HtmlEntities();

$htmlEntities->filter('&'); // &amp;
echo $htmlEntities->filter('"'); // &quot;

Zend Framework