[PHP] Problema ciclo while

<?php
ini_set('memory_limit', -1);
ini_set('max_execution_time', 0);
include 'class.php';
header("Content-type:application/json");
$API = new API("");
$start = "0";
$stop = "1";
$done = true;
$res = $API->portscan("208.80.152.201", 0, 1);
$count = count($res);
while($done){
while($count == $stop){
$res = $API->portscan("208.80.152.201", 0, 1);
for($n = $start; $n <= $stop; $n++){
    $return = NULL;
    $return .= json_encode(
        array(
         $n => array(
             'status' => $res[$n."_port"],
         )
        )
         );
         echo $return;
        }
        $done = false; 
    }
}