无法在自定义php邮件中附加图像

Question

我无法通过自定义PHP邮件发送附件。邮件发送正确，图片在服务器中正确上传，但附件没有通过电子邮件到达。这可能有什么问题？这是我的sendmail

authSendEmail($email, $name, $to, $WSiteCompany, "Business Opportunity", $message, $target_file); 

这是我的发送邮件代码。我没有想法？这可能是服务器问题还是代码问题？请协助

    //Attachment
     $filename = basename($filePath); // Filename that will be used for the file as the attachment 
    var_dump($filename);
$file_size = filesize($filePath);
$handle = fopen($filePath, "r");
$content = fread($handle, $file_size);
fclose($handle);
$content = chunk_split(base64_encode($content));
$uid = md5(uniqid(time()));
$fext = strtolower(substr(strrchr(basename($filename),"."),1));
$mtype = '';
$allowed_ext = array (


  // images
  'gif' => 'image/gif',
  'png' => 'image/png',
  'jpg' => 'image/jpeg',
  'jpeg' => 'image/jpeg'


);

if ($allowed_ext[$fext] == '') {

  // mime type is not set, get from server settings
  if (function_exists('mime_content_type')) {
    $mtype = mime_content_type($filePath);
  }
  else if (function_exists('finfo_file')) {
    $finfo = finfo_open(FILEINFO_MIME); // return mime type
    $mtype = finfo_file($finfo, $filePath);
    finfo_close($finfo);  
  }
  if ($mtype == '') {
    $mtype = "application/force-download";
  }
}
else {
  // get mime type defined by admin
  $mtype = $allowed_ext[$fext];
}
      $header  = "MIME-Version: 1.0\r\n";
$header .= "Content-Type: multipart/mixed; boundary=\"".$uid."\"\r\n\r\n";
$header .= "This is a multi-part message in MIME format.\r\n";
$header .= "--".$uid."\r\n";
$header .= "Content-type:text/html; charset=utf-8\r\n";
$header .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$header .= $message."\r\n\r\n";
$header .= "--".$uid."\r\n";
$header .= "Content-Type:".$mtype."; name=\"".$filename."\"\r\n"; 
$header .= "Content-Transfer-Encoding: base64\r\n";
$header .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";
$header .= $content."\r\n\r\n";
$header .= "--".$uid."--";
fputs($smtpConnect, "To: $to\nFrom: $from\nSubject: $subject\n$header\n\n$message\n.\n");


    $smtpResponse = fgets($smtpConnect, 515);
        $logArray['data2response'] = "$smtpResponse";