<form action="" method="get">
<input type="text" name="data" maxlength="64" size="64"/>
<input type="submit"/>
</form>
<?php
if ( isset( $_GET['data'] ) ) {
$filter = ini_get('filter.default');
echo "The data filterered through '$filter' is:";
var_dump( $_GET['data'] );
}
?>
Output