在flash中显示JSON

我试图使用JSON将数据拉到flash中,但我一直收到这个错误

JSONParseError: Unexpected < encountered
 at com.adobe.serialization.json::JSONTokenizer/parseError()
 at com.adobe.serialization.json::JSONTokenizer/getNextToken()
 at com.adobe.serialization.json::JSONDecoder/nextToken()
 at com.adobe.serialization.json::JSONDecoder()
 at com.adobe.serialization.json::JSON$/decode()
 at jsonairtest_fla::MainTimeline/decodeJSON()
 at flash.events::EventDispatcher/dispatchEventFunction()
 at flash.events::EventDispatcher/dispatchEvent()
 at flash.net::URLLoader/onComplete()

尽管我无法在浏览器中运行pp文件,而且输出对我来说很好,但我甚至尝试调用一个txt文件,这很有效,但我不知道我在这里做错了什么。

这是AS3代码

 import com.adobe.serialization.json.JSON

    var loader:URLLoader = new URLLoader();
    var request:URLRequest = new URLRequest();


    request.url = "pull.php";
    loader.load(request);

    loader.addEventListener(Event.COMPLETE, decodeJSON);


    function decodeJSON(event:Event):void{
    var loader2:URLLoader = URLLoader(event.target);
    //trace(event.target.data);
    var People:Array = JSON.decode(loader2.data);

    trace(People[0].NETWORKNAME) ; 
    trace(People[1].NETWORKNAME) ; 

      }

PHP代码:

 <?php

       $host="localhost";
       $user="";
       $password="";
       $database="db name";
       $tablename="table name";

       header('Content-type: application/json');

       if(!$connection = mysql_connect($host,$user,$password))
        {
            //if connection not eastablished then display message and die
            $message = mysql_error();
            //echo "$message<br>";
            die();
        }else
        // in case the connection is eastablished 
        $message = "Connection eastablished.....";
        //echo"$message<br>";
         mysql_select_db($database,$connection)
            or die("database not found");
         $query = mysql_query("SELECT NETWORKNAME from $tablename);
        $returnArray = array(); 
         while($row=mysql_fetch_assoc($query))
         array_push($returnArray, $row);

        mysql_close();
        echo json_encode($returnArray);

    ?>