UserInput/docs/tutorial_example_01_def.php

<?php
$definition = array(
    'firstName' => new ezcInputFormDefinitionElement(
        ezcInputFormDefinitionElement::REQUIRED, 'string'
    ),
    'lastName' => new ezcInputFormDefinitionElement(
        ezcInputFormDefinitionElement::REQUIRED, 'string'
    ),
    'age' => new ezcInputFormDefinitionElement(
        ezcInputFormDefinitionElement::REQUIRED, 'int',
        array( 'min_range' => 1, 'max_range' => 99 ),
        FILTER_FLAG_ALLOW_HEX
    ),
    'email' => new ezcInputFormDefinitionElement(
        ezcInputFormDefinitionElement::REQUIRED, 'validate_email'
    ),
);
?>