邮件中的图像文件附件不能通过PHP正确发送

我使用mail()函数来测试发送带有图像文件附件的电子邮件给我自己。这个脚本的问题是，当我查看电子邮件时，我看到了一长排随机数字、字母和符号，而这些本来应该是图像。

请不要推荐PHPmailer或在消息正文中手动放置图像标签。

我使用的主PHP文件:

<?
 include('init.php'); 
if (isset($_POST['name'], $_FILES['file'])){
    $body = <<<BODY
    From: {$_POST['name']}
    Details: 
        Name:   {$_FILES['file']['name']}
        Size:   {$_FILES['file']['size']}
        Type:   {$_FILES['file']['type']}
BODY;
mail_file('receiver@email.com','test@php.com','a file upload',$body,$_FILES['file']);   
}
?>
<form action="" method="POST" enctype="multipart/form-data">
   <input type="text" name="name" id="name">
   <input type="file" name="file" id="file">
   <input type="submit" value="Email File">
</form>

init.php:

<?
$path = dirname(__FILE__);
include("{$path}/mail.php");
?>

mail.php:

<? 
function mail_file($to, $from, $subject, $body, $file){
    $boundary = md5(rand());
    $headers = array(
        'MIME-Version: 1.0',
        "Content-Type: multipart/mixed; boundary="{$boundary}"",
        "From: {$from}"
    );
    $message = array(
        "--{$boundary}",
        'Content-Type: text/html',
        'Content-Transfer-Encoding: 7bit',
        '',
        chunk_split($body),
        "--{$boundary}",
        "Content-Type: {$file['type']}; name="{$file['name']}"",
        "Content-Disposition: attachment; name="{$file['name']}"",
        "Content-Transfer-Encoding: base64",
        '',
        chunk_split(base64_encode(file_get_contents($file['tmp_name']))),
        "--{$boundary}--"
    );
    mail($to, $subject, implode('rn', $message), implode('rn', $headers));
}
?>

发送的电子邮件示例:

--4f8b4f63eb5fb4f1c3cde903c7e5b306rnContent-Type: text/htmlrnContent-Transfer-Encoding: 7bitrnrn    From: asas
Details: 
Name: 728x90-Brink-Banner-V2.jpg
Size:   41583
Type:   image/jpeg
rn--4f8b4f63eb5fb4f1c3cde903c7e5b306rnContent-Type: image/jpeg; name="728x90-Brink-Banner-V2.jpg"rnContent-Disposition: attachment; name="728x90-Brink-Banner-V2.jpg"rnContent-Transfer-Encoding: base64rnrn/9j/4AAQSkZJRgABAgAAZABkAAD/7AARRHVja3kAAQAEAAAAUAAA/+4ADkFkb2JlAGTAAAAAAf/b
AIQAAgICAgICAgICAgMCAgIDBAMCAgMEBQQEBAQEBQYFBQUFBQUGBgcHCAcHBgkJCgoJCQwMDAwM
DAwMDAwMDAwMDAEDAwMFBAUJBgYJDQsJCw0PDg4ODg8PDAwMDAwPDwwMDAwMDA8MDAwMDAwMDAwM
DAwMDAwMDAwMDAwMDAwMDAwM/8AAEQgAWgLYAwERAAIRAQMRAf/EAOgAAAAGAwEAAAAAAAAAAAAA
AAMEBQYHCAECCQABAAAHAQEBAAAAAAAAAAAAAAABAgMEBQYHCAkQAAEDAgUBBgMDBAsHDA0NAQEC

...

L81/7CT7TfOuj+7T/wCxbf6cmeeXwouVG4P5we/F/E/yvzHTHMh6q9MNzUc7m/T5X4f4h6fP+6uF
jIJbcyh7Z0b6/h/d6fbhYSHp7D+cIXk/RYHy/RU9P+y/j6sIk9VBmYV1+H+sf9B6Dz+b7cZufPat
RB6oyV2LP+B/6NfhD8X8X7Ph34OPJMy+so95T/RGP/NzzD+bfxuuFyeoozf1ozUXWfoz+n/jJ/Rv
P9n8XvxTvzWktcx8eSvxxR+Gn9P6p83k7Ov72JFl4VE1T1tngUtb2/mmd+H+iu/jfyD1xZyZKqhz
VHdz/wA4H9F/Aa6/h/oKPxP+y+GKmX4eNXtuv//Z
rn--4f8b4f63eb5fb4f1c3cde903c7e5b306--

问题出在这里:

mail($to, $subject, implode('rn', $message), implode('rn', $headers));

您使用了单引号，新行被视为4个字符的字符串rn，将其更改为:

mail($to, $subject, implode("rn", $message), implode("rn", $headers));

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