How can I use PECL Filter to 'automagically' filter user input ?

I DO understand calling the PECL filter directly in a PHP script like so:
<?php
$clean = array();

$clean['name'] = input_get(INPUT_POST, 'name', FL_REGEXP, array ('regexp' => '^[\w ]+$'));
$clean['age']   = input_get(INPUT_POST, 'age',   FL_INT);
$clean['email'] = input_get(INPUT_POST, 'email', FL_EMAIL);
$clean['list']  = input_get(INPUT_POST, 'list',  FL_BOOLEAN);
?>

But where does 'automagically' come into play?
Does 'automagically' mean preconfiguring the filter to run from configuration script like php.ini ?




I am referencing a Rasmus article.
http://toys.lerdorf.com/index.php?url=archives/38-The-no-framework- PHP-MVC-framework.html&serendipity[csuccess]=moderate#feedback


many thanks

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