问题：

使用PHP在电子邮件中发送多个附件

宋臻

2023-03-14

我在发送带有多个附件的电子邮件时遇到问题。代码如下：

<?php

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

        foreach($_FILES['uploadEmail']['error'] as $key=>$value){
            if(!$_FILES['uploadEmail']['error'][$key]){
                $target_path = "";
                $target_path = $target_path . basename( $_FILES['uploadEmail']['name'][$key]); 
                if(move_uploaded_file($_FILES['uploadEmail']['tmp_name'][$key], $target_path)){
                    $files[] = $_FILES['uploadEmail']['name'][$key];
                }
            }
        }

        $toEmails = explode(",",$_POST['toEmail']);
        $count = count($toEmails);
        $i = 0;    $j = 1;    $k = 100;
        $bcc = '';
        while($i<$count){
            $bcc .= $toEmails[$i].",";
            if($j==$k || $i==$count-1){
                $j=1;
                //echo $bcc.'<br />'.$sub.'<br />'.$message.'<br /><br />';
                $from = 'test@gmail.com';
                $sub = $_POST['subject'];
                $message = $_POST['message'];

                /////////////////////////
                $headers = 'From:'. $from . "\r\n";
                $headers .= "Bcc:". $bcc . "\r\n";


                // boundary 
                $semi_rand = md5(time()); 
                $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x"; 

                // headers for attachment 
                $headers .= "\nMIME-Version: 1.0\n" . "Content-Type: multipart/mixed;\n" . " boundary=\"{$mime_boundary}\""; 

                // multipart boundary 
                $message = "This is a multi-part message in MIME format.\n\n" . "--{$mime_boundary}\n" . "Content-Type: text/html; charset=\"iso-8859-1\"\n" . "Content-Transfer-Encoding: 7bit\n\n" . $message . "\n\n"; 
                $message .= "--{$mime_boundary}\n";

                // preparing attachments
                for($x=0;$x<count($files);$x++){
                    $file = fopen($files[$x],"rb");
                    //echo "<br>".filesize($files[$x]);
                    $data = fread($file,filesize($files[$x]));
                    fclose($file);
                    $data = chunk_split(base64_encode($data));
                    $message .= "Content-Type: {\"application/octet-stream\"};\n" . " name=\"$files[$x]\"\n" . 
                    "Content-Disposition: attachment;\n" . " filename=\"$files[$x]\"\n" . 
                    "Content-Transfer-Encoding: base64\n\n" . $data . "\n\n";
                    $message .= "--{$mime_boundary}\n";
                }

                    // send
                    /////////////////////////

                mail('',$sub,$message,$headers);
                $bcc = '';
            }else{
                $j++;
            }
            $i++;
        }
    }
?>
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>

<script src="http://js.nicedit.com/nicEdit-latest.js" type="text/javascript"></script>
<script type="text/javascript">bkLib.onDomLoaded(function() {
        new nicEditor().panelInstance('message');
       // new nicEditor({fullPanel : true}).panelInstance('area2');
  });</script>
</head>
<body>
<form method="POST" enctype="multipart/form-data">
    <table>
        <tr><td><label for="toEmail">Send To : </label></td><td><textarea id="toEmail" name="toEmail" cols="100" rows="10"></textarea></td></tr>
        <tr><td><label for="subject">Subject : </label></td><td><input type="text" name="subject" id="subject" size="98"></td></tr>
        <tr><td><label for="toEmail">Message : </label></td><td><textarea id="message" name="message" cols="100" rows="10"></textarea></td></tr>
        <tr><td><label for="upload[]">Attachments:</label></td><td></td></tr>
        <tr><td><label>1</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>2</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>3</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>4</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>5</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>6</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>7</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>8</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>9</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td><label>10</label></td><td><input type="file" name="uploadEmail[]"></td></tr>
        <tr><td colspan="2" align="center"><input type="submit" value="Send Email" name="sendEmail" id="sendEmail"></td></tr>
    </table>
</form>
<body>
</html>

我收到邮件，但找不到任何附件。有人知道会出什么问题吗？

下面是我在Mail中得到的电子邮件正文：

MIME-Version: 1.0 Content-Type: multipart/mixed; 
boundary="==Multipart_Boundary_x2d454346f03d2c19cfefc838ce4d8623x"

This is a multi-part message in MIME format.

--==Multipart_Boundary_x2d454346f03d2c19cfefc838ce4d8623x Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

ds fsdfsdfsdfsdfsdfsdfsf sffdfsdfsdfs fsdfdf sdf s

--==Multipart_Boundary_x2d454346f03d2c19cfefc838ce4d8623x Content-Type: {"application/octet-stream"};  name="/tmp/phpHFTvAw"
Content-Disposition: attachment;  filename="Lighthouse.jpg"
Content-Transfer-Encoding: base64




--==Multipart_Boundary_x2d454346f03d2c19cfefc838ce4d8623x Content-Type: {"application/octet-stream"};  name="/tmp/phpyX67HR"
Content-Disposition: attachment;  filename="Penguins.jpg"
Content-Transfer-Encoding: base64




--==Multipart_Boundary_x2d454346f03d2c19cfefc838ce4d8623x

葛宏爽

2023-03-14

您的代码有一些问题，我将在下面详细介绍。

Line endings

$headers = 'From:'. $from . "\r\n";
$headers .= "Bcc:". $bcc . "\r\n";

...

// headers for attachment 
$headers .= "\nMIME-Version: 1.0\n"
         .  "Content-Type: multipart/mixed;\n"
         .  " boundary=\"{$mime_boundary}\""; 
// multipart boundary 
$message = "This is a multi-part message in MIME format.\n\n"
         . "--{$mime_boundary}\n"
         . "Content-Type: text/html; charset=\"iso-8859-1\"\n"
         . "Content-Transfer-Encoding: 7bit\n\n"
         . $message
         . "\n\n"; 
$message .= "--{$mime_boundary}\n";

电子邮件中的行由CRLF(\r\n)序列分隔。不清楚mail()函数是否将\n转换为\r\n，但考虑到您的from:和bcc:头使用的是\r\n，这些头可能应该使用相同的。您的输出还指示行尾可能丢失或格式不正确。

从PHP手册：

$message .= "Content-Type: {\"application/octet-stream\"};\n"
         .  " name=\"$files[$x]\"\n" .

删除大括号和引号：

$message .= "Content-Type: application/octet-stream\n"
         .  " name=\"$files[$x]\"\n" .

此外，在content-disposition头中，不推荐使用name参数，而使用filename参数。如果您想保留它以获得一些向后兼容性，则应该从它中删除路径。（输出表明您使用的是tmp_name而不是name)。

$message .= "--{$mime_boundary}\n";

// preparing attachments
for($x=0;$x<count($files);$x++){
  ...
  $message .= /* body part */;
  $message .= "--{$mime_boundary}\n";
}

注意，最后的分隔符必须有两个尾随的破折号。在循环的开头插入分隔分隔符,并在循环后添加关闭分隔符：

// preparing attachments
for($x=0;$x<count($files);$x++){
  $message .= "--{$mime_boundary}\n";
  ...
  $message .= /* body part */;
}

$message .= "--{$mime_boundary}--\n";

请参阅下面有关电子邮件语法的部分。

$k = 100;
...
while($i<$count){
  $bcc .= $toEmails[$i].",";
  if($j==$k || $i==$count-1){
    ...
    $headers .= "Bcc:". $bcc . "\r\n";

请注意，电子邮件中有行长限制。RFC 5322：

   ...                    Each line of characters MUST be no more than
   998 characters, and SHOULD be no more than 78 characters, excluding
   the CRLF.

您可能希望缩短密件抄送或引入FWS（折叠空白）：

$bcc .= $toEmails[$i].",\r\n ";  /* FWS */

一些可能有用或不有用的其他问题或通知：

foreach($_FILES['uploadEmail']['error'] as $key=>$value){
    if(!$_FILES['uploadEmail']['error'][$key]){

最后一行与：

    if(!$value){

$target_path = "";
$target_path = $target_path . basename( $_FILES['uploadEmail']['name'][$key]);

我假设$target_path应该被初始化到一个上载目录。

$toEmails = explode(",",$_POST['toEmail']);

一般情况下，您不应该允许随机用户提供传出电子邮件地址，但我怀疑这是一个可信任用户的内部应用程序。

这是根据RFC2046的多部分消息体结构的摘录。（BNF语法，略有简化。）

multipart-body := [preamble CRLF]
                  dash-boundary CRLF
                  body-part *encapsulation
                  close-delimiter
                  [CRLF epilogue]

dash-boundary := "--" boundary

body-part := MIME-part-headers [CRLF *OCTET]

encapsulation := delimiter
                 CRLF body-part

delimiter := CRLF dash-boundary

close-delimiter := delimiter "--"

~~RFC 2822 Internet消息格式~~ （已被RFC 5322淘汰）
RFC 5322 Internet消息格式
RFC 2045(MIME)第一部分：Internet消息正文格式
RFC 2046(MIME)第二部分：介质类型

使用PHP在电子邮件中发送多个附件

共有1个答案

Line endings

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