request.php

function R($param, $default=null, $type='string') {
    if(!isset($_REQUEST[$param]))
        return $default;
    $r = $_REQUEST[$param];
    if($type === 'bool' || $type === 'boolean') {
        if($r === 'false' || $r === 'no')
            return false;
        return !empty($r);
    }
    settype($r, $type);
    return $r;
}