如何使用PHP发送带有内联附加图像的HTML电子邮件

Question

我有一个PHP脚本,它发送带有附加图像的HTML电子邮件.它工作得很漂亮,但是,我无法<img>在电子邮件正文中的标签中显示附件.调用附加文件postcard.png,服务器上的原始文件名为4e60348f83f2f.png.我试着给图像URL各种东西:cid:postcard.png,cid:4e60348f83f2f.png,postcard.png,和4e60348f83f2f.png.什么都行不通.

我认为我做错的关键部分在这里,因为这使它成为一个单独的附件而不是我可以使用的内联附件:

Content-Transfer-Encoding: base64
Content-Disposition: attachment;
    filename="$fname" // i.e.: "postcard.png"

我已经尝试将其更改为使用CID,但我真的不知道该怎么做,而且这根本不起作用:

Content-Transfer-Encoding: base64
Content-ID: <$fname> // i.e.: postcard.png

这是完整的代码:(它基于来自php 页面中的注释的代码mail().)

<?php
$to      = "recipient@email.com";
$email   = "sender@email.com";
$name    = "Namename";
$subject = "An inline image!"; 
$comment = "Llookout <b>Llary</b> it's <br> the <b>Ll</b>andllord!<br><img src='cid:postcard.png'><br><img src='cid:4e60348f83f2f.png'><img src='postcard.png'><br><img src='4e60348f83f2f.png'>";

$To          = strip_tags($to);
$TextMessage =strip_tags(nl2br($comment),"<br>");
$HTMLMessage =nl2br($comment);
$FromName    =strip_tags($name);
$FromEmail   =strip_tags($email);
$Subject     =strip_tags($subject);

$boundary1   =rand(0,9)."-"
    .rand(10000000000,9999999999)."-"
    .rand(10000000000,9999999999)."=:"
    .rand(10000,99999);
$boundary2   =rand(0,9)."-".rand(10000000000,9999999999)."-"
    .rand(10000000000,9999999999)."=:"
    .rand(10000,99999);

$filename1 = "4e60348f83f2f.png"; //name of file on server with script
$handle      =fopen($filename1, 'rb'); 
$f_contents  =fread($handle, filesize($filename1)); 
$attachment=chunk_split(base64_encode($f_contents));
fclose($handle); 

$ftype       ="image/png";
$fname       ="postcard.png"; //what the file will be named


$attachments='';
$Headers     =<<<AKAM
From: $FromName <$FromEmail>
Reply-To: $FromEmail
MIME-Version: 1.0
Content-Type: multipart/mixed;
    boundary="$boundary1"
AKAM;

$attachments.=<<<ATTA
--$boundary1
Content-Type: $ftype;
    name="$fname"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
    filename="$fname"


$attachment

ATTA;


$Body        =<<<AKAM
This is a multi-part message in MIME format.

--$boundary1
Content-Type: multipart/alternative;
    boundary="$boundary2"

--$boundary2
Content-Type: text/plain;
    charset="windows-1256"
Content-Transfer-Encoding: quoted-printable

$TextMessage
--$boundary2
Content-Type: text/html;
    charset="windows-1256"
Content-Transfer-Encoding: quoted-printable

$HTMLMessage

--$boundary2--

$attachments
--$boundary1--
AKAM;

// Send email
$ok=mail($To, $Subject, $Body, $Headers);
echo $ok?"<h1> Mail sent!</h1>":"<h1> Mail not sent!</h1>";
?>

Answer 1

我终于找到了答案,结果非常简单.这个页面帮助我解决了这个问题,但我将在下面展示我需要完成的部分.

首先,创建边界字符串,图像,正确编码和分块:

// Create a boundary string.  It needs to be unique (not in the text) so ...
// We are going to use the sha1 algorithm to generate a 40 character string:
$sep = sha1(date('r', time()));

// Also now prepare our inline image - Also read, encode, split:
$inline = chunk_split(base64_encode(file_get_contents('figure.gif')));

在电子邮件的HTML部分中,图像被引用(使用边界字符串):

<img src="cid:PHP-CID-{$sep}">

然后,您在内联附件的HTML部分下面创建电子邮件的另一部分,如下所示:

--PHP-related-{$sep}
Content-Type: image/gif
Content-Transfer-Encoding: base64
Content-ID: <PHP-CID-{$sep}>
{$inline}

......那就是那个!比实现PHPmailer或任何其他库更容易,如果你正在做的那样.毫无疑问,对于更复杂的任务,您需要获得其中一个库.