Writing Filters¶
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\FilterInterface.
Zend\Filter\FilterInterface defines a single method, filter(), that may be implemented by user classes.
Example¶
The following example demonstrates how to write a custom filter:
1 2 3 4 5 6 7 8 9 10 11 12 13 | namespace Application\Filter;
use Zend\Filter\FilterInterface;
class MyFilter implements FilterInterface
{
public function filter($value)
{
// perform some transformation upon $value to arrive on $valueFiltered
return $valueFiltered;
}
}
|
To attach an instance of the filter defined above to a filter chain:
1 2 | $filterChain = new Zend\Filter\FilterChain();
$filterChain->attach(new Application\Filter\MyFilter());
|