Zend Framework 1.6.2 Manual

Zend_Filter supplies a set of commonly needed filters, but developers will often need to write custom filters for their particular use cases. The task of writing a custom filter is facilitated by implementing Zend_Filter_Interface.

Zend_Filter_Interface defines a single method, filter(), that may be implemented by user classes. An object that implements this interface may be added to a filter chain with Zend_Filter::addFilter().

The following example demonstrates how to write a custom filter:

    


    

        To add an instance of the above filter to a filter chain:

        
addFilter(new MyFilter());