Uploading photos with socket

Can I use php socket to upload files from a visitors' local machine to my server ?

What I am trying to do is i have a large file that needs to be uploaded , I would like it to be uploaded in the background of the site to allow my visitor to continue doing other things while the file is uploaded .
Is that possible with php?   (doesn't need to be socket i was just thinking it might work with that although as far as i understand there is no multy threading in php)
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//   You may change maxsize, and allowable upload file types.
//Mmaximum file size. You may increase or decrease.
$MAX_SIZE = 2000000;
//Allowable file ext. names. you may add more extension names.            
$FILE_EXTS  = array('.zip','.jpg','.png','.gif','.doc');

//Allow file delete? no, if only allow upload only
$DELETABLE  = true;                              

//   Do not touch the below if you are not confident.
 *     Setup variables
$site_name = $_SERVER['HTTP_HOST'];
$url_dir = "http://".$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']);
$url_this =  "http://".$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];

$upload_dir = "files/";
$upload_url = $url_dir."/files/";
$message ="";

 *     Create Upload Directory
if (!is_dir("files")) {
  if (!mkdir($upload_dir))
        die ("upload_files directory doesn't exist and creation failed");
  if (!chmod($upload_dir,0755))
        die ("change permission to 755 failed.");

 *     Process User's Request
if ($_REQUEST[del] && $DELETABLE)  {
  $resource = fopen("log.txt","a");
  fwrite($resource,date("Ymd h:i:s")."DELETE - $_SERVER[REMOTE_ADDR]"."$_REQUEST[del]\n");
  if (strpos($_REQUEST[del],"/.")>0);                  //possible hacking
  else if (strpos($_REQUEST[del],$upload_dir) === false); //possible hacking
  else if (substr($_REQUEST[del],0,6)==$upload_dir) {
    print "<script>window.location.href='$url_this?message=deleted successfully'</script>";
else if ($_FILES['userfile']) {
  $resource = fopen("log.txt","a");
  fwrite($resource,date("Ymd h:i:s")."UPLOAD - $_SERVER[REMOTE_ADDR]"
            .$_FILES['userfile']['name']." "

  $file_type = $_FILES['userfile']['type'];
  $file_name = $_FILES['userfile']['name'];
  $file_ext = strtolower(substr($file_name,strrpos($file_name,".")));

  //File Size Check
  if ( $_FILES['userfile']['size'] > $MAX_SIZE)
     $message = "The file size is over 2MB.";
  //File Extension Check
  else if (!in_array($file_ext, $FILE_EXTS))
     $message = "Sorry, $file_name($file_type) is not allowed to be uploaded.";
     $message = do_upload($upload_dir, $upload_url);
  print "<script>window.location.href='$url_this?message=$message'</script>";
else if (!$_FILES['userfile']);
      $message = "Invalid File Specified.";

 *     List Files
$filelist = "";
while ($file = readdir($handle)) {
   if(!is_dir($file) && !is_link($file)) {
      $filelist .= "<a href='$upload_dir$file'>".$file."</a>";
      if ($DELETABLE)
        $filelist .= " <a href='?del=$upload_dir".urlencode($file)."' title='delete'>x</a>";
      $filelist .= "<sub><small><small><font color=grey>  ".date("d-m H:i", filemtime($upload_dir.$file))
      $filelist .="<br>";

function do_upload($upload_dir, $upload_url) {

      $temp_name = $_FILES['userfile']['tmp_name'];
      $file_name = $_FILES['userfile']['name'];
  $file_name = str_replace("\\","",$file_name);
  $file_name = str_replace("'","",$file_name);
      $file_path = $upload_dir.$file_name;

      //File Name Check
  if ( $file_name =="") {
        $message = "Invalid File Name Specified";
        return $message;

  $result  =  move_uploaded_file($temp_name, $file_path);
  if (!chmod($file_path,0777))
         $message = "change permission to 777 failed.";
    $message = ($result)?"$file_name uploaded successfully." :
                 "Somthing is wrong with uploading a file.";
  return $message;


   <font color=red><?=$_REQUEST[message]?></font>
   <form name="upload" id="upload" ENCTYPE="multipart/form-data" method="post">
     Upload File <input type="file" id="userfile" name="userfile">
     <input type="submit" name="upload" value="Upload">
   <br><b>My Files</b>
   <hr width=70%>
   <hr width=70%>
   <small><sup>Developed By
   <a style="text-decoration:none" href="http://tech.tailoredweb.com">TailoredWeb.com</a>
if you want the user to be able to do otehr things jsut have the uplaod script popup a window on link click

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