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8. Transforming Input Data with Filters

In this chapter, we will provide an overview of standard filters that can be used with your web forms. A filter is a class which takes some input data, processes it, and produces some output data. We will also show how to write a custom filter.

In general, you can even use filters outside forms to process an arbitrary data. For example, filters may be used in a controller action to transform the data passed as GET and/or POST variables to certain format.

ZF3 components covered in this chapter:

Component Description
Zend\Filter Contains various filters classes.
Zend\InputFilter Implements a container for filters/validators.