如何记录并获取从htML表单上传到 PHP脚本的当前字节？我想稍后将当前进度存储在会话或日志中,以便另一个AJAX脚本可以检索它.这是我当前读取当前字节的代码,但它不起作用.

$file_tyPE = $_FILES['Filedata']['type'];
$file_name = $_FILES['Filedata']['name'];
$file_size = $_FILES['Filedata']['size'];
$file_tmp = $_FILES['Filedata']['tmp_name'];

 $filePointer = fopen($_FILES['Filedata']['tmp_name'],"rb");
 $rr=0;

 if ($filePointer!=false){
 while (!feof($filePointer)){
     $fileData = fread($filePointer,4096);
     $rr =$rr+strlen($fileData);
     // PRocess the contents of the uploaded file here...
     $_SESSION['fname']=$rr;
 }

fclose($filePointer);
}

move_uploaded_file ($file_tmp,"files/".$file_name);