PHP / curl callback

<?php

 //$t=curl_multi_getcontent ($ch);
//list($header, $data) = explode("\n\n", $s4, 2);

session_start();

if (!isset($_POST['ajax'])) {
   draw_page();
   exit();
}

if (isset($_POST['url'])) {

   if ($_POST['url']=='') {
      show_test();
      exit();
   }

   show_image($_POST['url']);
}

if (isset($_POST['status'])) {

   echo 'url: '.@$_SESSION['url'].'<br/>getheader: '.@$_SESSION['getheader'].'<br/>'.
          @$_SESSION['status'];

   exit();
}

//--------------------------------------------
function show_image($link) {

   get_allheaders($link);
   echo 'avail= '.check_avail($link).'<br/>';
   echo 'is image= '.check_image($link).'<br/>';
   echo '<img src="'.load_image($link).'" width="400px" /><br/>';
}

//--------------------------------------------

function show_test() {

$links = array("test.jpg");


foreach ($links as $link) {

   get_allheaders($link);
   echo 'avail= '.check_avail($link).'<br/>';
   echo 'is image= '.check_image($link).'<br/>';
   echo '<img src="'.load_image($link).'" width="400px" /><br/>';
}

}
//--------------------------------------------

function draw_page() {

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
   <title>curl examples</title>

   <script type="text/javascript" src="jquery.min.js"></script>

   <script type="text/javascript">

var st, targ;
//----------------------------------------
function onBeforeSend(xhr, settings) {

   st.html('loading...please wait');
}
//----------------------------------------
function onSuccess(inf, status, xhr) {

   targ.html(inf);
}
//----------------------------------------
function onError(xhr, status, exception) {

   targ.html('error occured<br/>status:'+status+'<br/>exception:'+exception);

}
//----------------------------------------
function onComplete (xhr, status) {

    st.html('request completed, status:'+status);
    clearInterval(infoo);
}
//----------------------------------------
       $(document).ready (

   function() {

    st = $('#status');
    targ = $('#ajax');


    $('form[name=zz]').submit(
     function() {
        $.ajax ({
            type:'POST',
            url: location.href,
            data: {
               ajax:'',url: this.url.value
            },

            beforeSend: onBeforeSend,
            success: onSuccess,
            error: onError,
            complete: onComplete
        });

     window.infoo = setInterval ( function() {

        $.ajax ({
            type:'POST',
            url: "stat88.php",
            data: {
               ajax:'',status:''
            },

            success: function(inf) {

               $('#curlstatus').html(inf);

            },
        });

     }, 1000);

        return false;
     });


} )
   </script>


   <style type="text/css">
   * {
      margin:0;
      padding:0;
   }

   body {
      font-family: verdana, sans-serif;
      font-size: 1em;
   }

    #frm {
   float:left;
   width:400px;
   border: solid 1px #999;
   padding: 20px;
}

   #rez {
   margin-left:450px;

}

  #status {
   height: 10px;
   border: solid 1px #800;
   padding: 10px;
}

   #ajax {
   border: solid 1px #999;
   padding: 10px;
}

#curlstatus {
   font-size: 12px;
   word-wrap: break-word;
}

   </style>

</head>

<body>
   <div id="frm">
   <form name="zz" enctype="application/x-www-form-urlencoded">
   <p>input url:
   <input type="text" name="url" size="50" /></p>
   <input type="submit" value="send" />
   </form>
   <div id="curlstatus">
   </div>
   </div>

   <div id="rez">
   <div id="status"></div>
   <div id="ajax"</div>
   </div>

</body>
</html>


<?php

}

//---------------------------------------------
function load_image($url) {

   $s = get_url($url);


   return 'data:image/jpeg;base64,'.base64_encode($s);
}

//---------------------------------------------
function check_avail($url) {

   $s = get_url($url, true);
   return $s['http_code']==200;
}
//---------------------------------------------
function check_image($url) {

   $s = get_url($url, true);
   return (substr($s['content_type'],'image')!=-1) || $s['content_type']=='application/octet-stream';
}


//---------------------------------------------
function get_allheaders($url) {

    $s = get_url($url, true);
    echo '<pre>'.print_r($s,true).'</pre><br/>';
}

//---------------------------------------------
function callback($download_size, $downloaded, $upload_size, $uploaded)
{
   session_start();
    $_SESSION['status']= 'download size: '.$download_size.'<br/>downloaded: '.$downloaded.
      '<br/>upload size:'.$upload_size.'<br/>uploaded: '.$uploaded.'<br/>';

   session_write_close();
}

//---------------------------------------------
function get_url($url, $header=0) {

           $_SESSION['url']=$url;
           $_SESSION['getheader']=$header;
           $_SESSION['status']='started<br/>';


           $ch = curl_init();


           curl_setopt($ch, CURLOPT_NOPROGRESS, false);
           curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, 'callback');
           curl_setopt($ch, CURLOPT_BUFFERSIZE, 128);


       curl_setopt($ch, CURLOPT_HEADER, $header);
           curl_setopt ($ch, CURLOPT_NOBODY, $header);
           curl_setopt($ch, CURLOPT_URL, $url);

           curl_setopt($ch, CURLOPT_REFERER, 'http://www.google.com');

       curl_setopt($ch, CURLOPT_TIMEOUT, 10);
       curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
       curl_setopt($ch, CURLOPT_USERAGENT,
          "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)");
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
       curl_setopt($ch,CURLOPT_ENCODING, 1);

           session_write_close();
       $s4 = curl_exec($ch);


           $s = curl_getinfo($ch);

       if (curl_errno($ch)) {
          throw new Exception ('curl exception: '.curl_error($ch));
       }
       curl_close($ch);
           session_start();

           if ($header==1)
              return $s;
           else
              return $s4;

}


?>