Call php from javascript and return an array from php to Javascript function

Question

I want to write a function in javascript which will call the Getfilename.php and Get the $filesArray that is return in javascript.

GetFilenme.php is another file and

Answer 1

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}

function CallSomePHP(username, password)
{
    xmlhttp=GetXmlHttpObject();
    if (xmlhttp==null)
    {
    alert ("Browser does not support HTTP Request");
    return;
    }
    var url="myPhp.php";
    url = url+"?username="+username+"&password="+password;
    xmlhttp.onreadystatechange=stateChanged;
    xmlhttp.open("GET",url,true);
    xmlhttp.send(null);
}

function stateChanged()
{
    if (xmlhttp.readyState==4)
    {
        alert(xmlhttp.responseText); // this will alert "true";
    }
}

myphp.php