PHP5.2 New feature one(Filter)

Basically there exists some odd input form in html.
first form validate

Inupt page:input.html
submit page:filteringexample1a.php

Please check the two files,and find the php feature:
filter_var($_GET['1'], FILTER_SANITIZE_STRING)
And more detailed about the filter_var,please refer to the php.net

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