[PHP] parse form input

[Robert]

variables passed from form = 
part=68030&quan=500&I=x&part=68040&quan=350&I=x&sid=6754g543a76
I am sending several part numbers from the form, but when parsed it only gives me the 
last one
How do I get it to return all of the parts? I'm a PHP newbie, only been programming 
for 2 weeks...

<script language="php"
$i=0;
  if(!is_array($HTTP_POST_VARS))
    return;
    reset($HTTP_POST_VARS);
   while(list($key,$val)= each($HTTP_POST_VARS)){
   $GLOBAL[$key]= $val;
$val=stripslashes($val);
if ($key =="I"){$message=$message. "_________________________\n";}       //<---Divide 
parts into individual sections
if ($key !="sid" ){if ($key !="I"){$message=$message. "$key = $val\n";}}           
//<---Add to message unless key is sid
echo $key " = " $val;
 }
</script>

Thanks for any help