将PDF格式的表单提交到PHP脚本，然后通过电子邮件将PDF作为附件

我有这个脚本，它发布了一段时间，它可以工作，但是。。。在Safari工作中查找（通过浏览器）没有问题。火狐&Opera强制您打开Acrobat阅读器。当您从AcrobatReader（独立）提交时，php脚本提交会发送带有附件的电子邮件，但AcrobatReader会挂起"正在接收数据…"，然后超时。带有附件的电子邮件工作正常。Chrome在浏览器中打开并提交pdf，但停留在pdf页面上不重定向。Chrome发送的附件在电子邮件中，但它是空的，pdf文件没有打开。我的问题是：Acrobat Reader正在等待接收什么？Chrome是怎么回事？

这是代码

$fileatt = date("d-m-Y-His") . ".pdf";  // Creates unique PDF name from the date 
copy('php://input',"pdfs/".$fileatt); // Copies the pdf form data to a folder named pdfs 
$fileatt = "pdfs/".$fileatt; // Path to the file gives the pdfs folder plus the unique       file name we just assigned
$fileatt_type = "application/pdf"; // File Type 
$fileatt_name = "Application Form_".$fileatt.".pdf"; // Filename that will be used for the   file as the attachment when it is sent
$email_from = "mywebsite"; // Who the email is from 
$email_subject = "Completed online Applications"; // The Subject of the email 
$email_message = "Please find a recent online application attached.
";
$email_message .= "Any problems please email me...
"; // Message that the email has in it 
$email_to = "youremail@yourserver.com"; // Who the email is to 
$headers = "From: ".$email_from;
//no need to change anything else under this point
$file = fopen($fileatt,'rb'); 
$data = fread($file,filesize($fileatt)); 
fclose($file); 
$semi_rand = md5(time()); 
$mime_boundary = "==Multipart_Boundary_x{$semi_rand}x"; 
$headers .= "'nMIME-Version: 1.0'n" . 
"Content-Type: multipart/mixed;'n" . 
" boundary='"{$mime_boundary}'""; 
$email_message .= "This is a multi-part message in MIME format.'n'n" . 
"--{$mime_boundary}'n" . 
"Content-Type:text/html; charset='"iso-8859-1'"'n" . 
"Content-Transfer-Encoding: 7bit'n'n" . 
$email_message .= "'n'n"; 
$data = chunk_split(base64_encode($data)); 
$email_message .= "--{$mime_boundary}'n" . 
"Content-Type: {$fileatt_type};'n" . 
" name='"{$fileatt_name}'"'n" . 
//"Content-Disposition: attachment;'n" . 
//" filename='"{$fileatt_name}'"'n" . 
"Content-Transfer-Encoding: base64'n'n" . 
$data .= "'n'n" . 
"--{$mime_boundary}--'n"; 
$ok = @mail($email_to, $email_subject, $email_message, $headers); 
if($ok) { 
  unlink($fileatt); //NOW WE DELETE THE FILE FROM THE FOLDER pdfs 
  Header("Location: nextpage.php"); //where do we go once the form has been submitted.
} else { 
  die("Sorry but the email could not be sent. Please go back and try again!"); 
}