php - request data adjustment

function fixRequestData() {
/* unescape request data */
/* PHP doc claims for this to already been done, but I think it has to do with server setup. */
    if($_SERVER['REQUEST_METHOD'] == 'GET') {
        foreach ($_REQUEST as $key => $value) {
            $_REQUEST[$key] = urldecode( $value );
        }
    }
/* strip tags so that php/sql/html injection fails. */
    foreach ($_REQUEST as $key => $value) {
        $_REQUEST[$key] = strip_tags($value);
    }
}
/* run this function first as a safety precaution */
fixRequestData();