将查询字符串附加到功能操作URL的末尾

For the code below, I would like to append echo $_SERVER['QUERY_STRING']; to the end of index.php. But when I try to do it, it makes the code return a blank page. So I think I might be doing it wrong.

How can I correctly make this appendage?

Thanks in advance,

John

    <?php

    function show_loginform($disabled = false)
    {

        echo '<form name="login-form" id="login-form" method="post" action="./index.php"> 

    ...

    ?>

What about:

echo '<form name="login-form" id="login-form" method="post" action="./index.php?'.$_SERVER['QUERY_STRING'].'">';

hmmmm. Can you spell XSS?

I'd recommend going with this is a more safer option:

$url='./index.php';
$qry=array();
$join='';
foreach ($_GET as $name=>$val) {
   $join='?';
   $qry[]=urlencode($name) . '=' . urlencode($val);
}
$url.=$join . implode('&',$qry);
print "<....action='$url'>";