Drop down list based on log in username - php mysql

I have a drop down list of client names on a php page that filters a second drop down list of site names.
At the moment, any user who logs in can see the entire list of clients, however I want to filter the list based on their username log in.
This is the entire page code, the section in bold is the drop down list in question:
<?php
if (!isset($_SESSION)) {
session_start();
$MM_authorizedUsers = "asguser,admin,member";
$MM_donotCheckaccess = "false";
// *** Restrict Access To Page: Grant or deny access to this page
function isAuthorized($strUsers, $strGroups, $UserName, $UserGroup) {
// For security, start by assuming the visitor is NOT authorized.
$isValid = False;
// When a visitor has logged into this site, the Session variable MM_Username set equal to their username.
// Therefore, we know that a user is NOT logged in if that Session variable is blank.
if (!empty($UserName)) {
    // Besides being logged in, you may restrict access to only certain users based on an ID established when they login.
    // Parse the strings into arrays.
    $arrUsers = Explode(",", $strUsers);
    $arrGroups = Explode(",", $strGroups);
    if (in_array($UserName, $arrUsers)) {
      $isValid = true;
    // Or, you may restrict access to only certain users based on their username.
    if (in_array($UserGroup, $arrGroups)) {
      $isValid = true;
    if (($strUsers == "") && false) {
      $isValid = true;
return $isValid;
$MM_restrictGoTo = "accessdenied.html";
if (!((isset($_SESSION['MM_Username'])) && (isAuthorized("",$MM_authorizedUsers, $_SESSION['MM_Username'], $_SESSION['MM_UserGroup'])))) {
$MM_qsChar = "?";
$MM_referrer = $_SERVER['PHP_SELF'];
if (strpos($MM_restrictGoTo, "?")) $MM_qsChar = "&";
if (isset($_SERVER['QUERY_STRING']) && strlen($_SERVER['QUERY_STRING']) > 0)
$MM_referrer .= "?" . $_SERVER['QUERY_STRING'];
$MM_restrictGoTo = $MM_restrictGoTo. $MM_qsChar . "accesscheck=" . urlencode($MM_referrer);
header("Location: ". $MM_restrictGoTo);
exit;
?>
<html>
<body>
<script type="text/javascript">
function AjaxFunction(client_UID)
var httpxml;
try
// Firefox, Opera 8.0+, Safari
httpxml=new XMLHttpRequest();
catch (e)
// Internet Explorer
          try
                    httpxml=new ActiveXObject("Msxml2.XMLHTTP");
              catch (e)
                try
              httpxml=new ActiveXObject("Microsoft.XMLHTTP");
                catch (e)
              alert("Your browser does not support AJAX!");
              return false;
function stateck()
    if(httpxml.readyState==4)
var myarray=eval(httpxml.responseText);
// Before adding new we must remove previously loaded elements
for(j=document.testform.subcat.options.length-1;j>=0;j--)
document.testform.subcat.remove(j);
for (i=0;i<myarray.length;i++)
var optn = document.createElement("OPTION");
optn.text = myarray[i];
optn.value = myarray[i];
document.testform.subcat.options.add(optn);
    var url="dd.php";
url=url+"?client_UID="+client_UID;
url=url+"&sid="+Math.random();
httpxml.onreadystatechange=stateck;
httpxml.open("GET",url,true);
httpxml.send(null);
</script>
<form name="testform" method='POST' action='mainck.php'>
Select first one
<select name=cat onChange="AjaxFunction(this.value);">
<option value=''>Select One</option>
<?
require "config.php";// connection to database
$q=mysql_query("SELECT DISTINCT * FROM qry_test GROUP BY client_name ASC");
while($n=mysql_fetch_array($q)){
echo "<option value=$n[client_UID]>$n[client_name]</option>";
?>
</select>
<select name=subcat>
</select><input type=submit value=submit>
</form>
</body>
</html>
I think I need to amend the sql statement to something like this - but I haven't quite got it right:
SELECT DISTINCT * FROM qry_test WHERE username = colname GROUP BY client_name ASC
Where do I drop the code for the colname info?
name:colname
type: text
default value: -1
run time value: $_SESSION['MM_Username']
Thanks!

I don't do PHP but it would be something like:
$sql = sprintf (SELECT DISTINCT * FROM qry_test WHERE username = %s GROUP BY client_name ASC, $_SESSION['MM_Username'] );
or you can just embed the session variable into the sql string.
But why are you using the GROUP BY clause? If you just need a distinct list of names, use the DISTINCT keyword and reduce your select list to only the needed column.

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Drop down list based on log in username - php mysql

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