dato un file html
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <script type="text/javascript" language="javascript">

            var http_request = false;

            function makeRequest(url) {

                http_request = false;

                if (window.XMLHttpRequest) { // Mozilla, Safari,...
                    http_request = new XMLHttpRequest();
                    if (http_request.overrideMimeType) {
                        http_request.overrideMimeType('text/xml');
                    }
                } else if (window.ActiveXObject) { // IE
                    try {
                        http_request = new ActiveXObject("Msxml2.XMLHTTP");
                    } catch (e) {
                        try {
                        http_request = new ActiveXObject("Microsoft.XMLHTTP");
                        } catch (e) {}
                    }
                }

                if (!http_request) {
                    alert('Giving up :( Cannot create an XMLHTTP instance');
                    return false;
                }
                http_request.onreadystatechange = alertContents;
                http_request.open('GET', url, true);
                http_request.send(null);

            }

            function alertContents() {

                if (http_request.readyState == 4) {
                    if (http_request.status == 200) {
                        var pippo = http_request.responseText;
                        //alert(http_request.responseText);
                    } else {
                        alert('There was a problem with the request.');
                    }
                }
            if (pippo) return pippo;//alert (pippo);
            }
          
        </script>
    </head>
    <body>
        <span
            style="cursor: pointer; text-decoration: underline"
            onclick="alert(send_request('test.php?array='));">
                Make a request
        </span>

    </body>
</html>
e un file php
Codice PHP:
<?
$array_mio=array("A"=>array("X1"=>"A_uno","X2"=>"A_due"),
        "B"=>array("X1"=>"B_uno","X2"=>"B_due"),
        "C"=>array("X1"=>"C_uno","X2"=>"C_due"),
        "D"=>array("X1"=>"D_uno","X2"=>"D_due"),
        "E"=>array("X1"=>"E_uno","X2"=>"E_due"),
        "F"=>array("X1"=>"F_uno","X2"=>"F_due"),
        "G"=>array("X1"=>"G_uno","X2"=>"G_due"),
        "H"=>array("X1"=>"H_uno","X2"=>"H_due"),
        "I"=>array("X1"=>"I_uno","X2"=>"I_due"),
        "L"=>array("X1"=>"L_uno","X2"=>"L_due"),
        "M"=>array("X1"=>"M_uno","X2"=>"M_due"),
        "N"=>array("X1"=>"N_uno","X2"=>"N_due"),
        "O"=>array("X1"=>"O_uno","X2"=>"O_due"),
        "P"=>array("X1"=>"P_uno","X2"=>"P_due"),
        "Q"=>array("X1"=>"Q_uno","X2"=>"Q_due"));


if (isset($_GET['nome'])) echo "Mirko";
if (isset($_GET['nick'])) echo "dottwatson";
if (isset($_GET['age'])) echo "00";
if (isset($_GET['array'])) $val = arr2xml  ($array_mio);


if ($val)echo $val;






function arr2xml($array)
  {
  include('assoc_array2xml.php');
  $converter= new assoc_array2xml;
  $string=$converter->array2xml($array);
  return $string;
  }

function xml2arr($code)
  {
  include('assoc_array2xml.php');
  $converter= new assoc_array2xml;
  $string=$converter->xml2array($code);
  return $string;
  }
?>
perchè la variabile non mi torna indietro? eppure l' xml viene generato correttamente se faccio un alert all' interno del ciclo alertContents()