PHP anti-XSS anti-SQL injection code

function gjj($str)
{
    $farr = array(
        "/\\s+/",
        "/<(\\/?)(script|i?frame|style|html|body|title|link|meta|object|\\?|\\%)([^>]*?)>/isU",
        "/(<[^>]*)on[a-zA-Z]+\s*=([^>]*>)/isU",
    );
    $str = preg_replace($farr,"",$str);
    return addslashes($str);
}
 
function hg_input_bb($array)
{
    if (is_array($array))
    {
        foreach($array AS $k => $v)
        {
            $array[$k] = hg_input_bb($v);
        }
    }
    else
    {
        $array = gjj($array);
    }
    return $array;
}
$_REQUEST = hg_input_bb($_REQUEST);
$_GET = hg_input_bb($_GET);
$_POST = hg_input_bb($_POST);