Swiftmailer是另一个易于使用的脚本，可以自动防止电子邮件注入，使附件变得轻而易举。我也强烈反对使用PHP内置的mail()函数。

使用方法:

下载Swiftmailer，并将lib文件夹放在你的项目中 使用require_once 'lib/swift_required.php'包含主文件;

现在当你需要邮寄时添加代码:

// Create the message
$message = Swift_Message::newInstance()
    ->setSubject('Your subject')
    ->setFrom(array('webmaster@mysite.com' => 'Web Master'))
    ->setTo(array('receiver@example.com'))
    ->setBody('Here is the message itself')
    ->attach(Swift_Attachment::fromPath('myPDF.pdf'));

//send the message          
$mailer->send($message);

更多信息和选项可以在Swiftmailer文档中找到。

在与格式糟糕的附件斗争了一段时间后，我使用了以下代码:

$email = new PHPMailer();
$email->From      = 'from@somedomain.com';
$email->FromName  = 'FromName';
$email->Subject   = 'Subject';
$email->Body      = 'Body';
$email->AddAddress( 'to@somedomain.com' );
$email->AddAttachment( "/path/to/filename.ext" , "filename.ext", 'base64', 'application/octet-stream' );
$email->Send();

你可以使用我创建的这个类发送常规邮件或附件邮件。

下面是如何使用它的示例链接。

https://github.com/Nerdtrix/EZMAIL

您可以尝试使用以下代码:

    $filename = 'myfile';
    $path = 'your path goes here';
    $file = $path . "/" . $filename;

    $mailto = 'mail@mail.com';
    $subject = 'Subject';
    $message = 'My message';

    $content = file_get_contents($file);
    $content = chunk_split(base64_encode($content));

    // a random hash will be necessary to send mixed content
    $separator = md5(time());

    // carriage return type (RFC)
    $eol = "\r\n";

    // main header (multipart mandatory)
    $headers = "From: name <test@test.com>" . $eol;
    $headers .= "MIME-Version: 1.0" . $eol;
    $headers .= "Content-Type: multipart/mixed; boundary=\"" . $separator . "\"" . $eol;
    $headers .= "Content-Transfer-Encoding: 7bit" . $eol;
    $headers .= "This is a MIME encoded message." . $eol;

    // message
    $body = "--" . $separator . $eol;
    $body .= "Content-Type: text/plain; charset=\"iso-8859-1\"" . $eol;
    $body .= "Content-Transfer-Encoding: 8bit" . $eol;
    $body .= $message . $eol;

    // attachment
    $body .= "--" . $separator . $eol;
    $body .= "Content-Type: application/octet-stream; name=\"" . $filename . "\"" . $eol;
    $body .= "Content-Transfer-Encoding: base64" . $eol;
    $body .= "Content-Disposition: attachment" . $eol;
    $body .= $content . $eol;
    $body .= "--" . $separator . "--";

    //SEND Mail
    if (mail($mailto, $subject, $body, $headers)) {
        echo "mail send ... OK"; // or use booleans here
    } else {
        echo "mail send ... ERROR!";
        print_r( error_get_last() );
    }

编辑14 - 6 - 2018

为更多的可读性在一些电子邮件提供商 使用

$body .= $eol。美元的消息。eol美元。eol美元;而且 $body .= $eol。美元的内容。eol美元。eol美元;

HTML代码:

<form enctype="multipart/form-data" method="POST" action=""> 
    <label>Your Name <input type="text" name="sender_name" /> </label> 
    <label>Your Email <input type="email" name="sender_email" /> </label> 
    <label>Your Contact Number <input type="tel" name="contactnumber" /> </label>
    <label>Subject <input type="text" name="subject" /> </label> 
    <label>Message <textarea name="description"></textarea> </label> 
    <label>Attachment <input type="file" name="attachment" /></label> 
    <label><input type="submit" name="button" value="Submit" /></label> 
</form> 

PHP代码:

<?php
if($_POST['button']){
{
    //Server Variables
    $server_name = "Your Name";
    $server_mail = "your_mail@domain.com";

    //Name Attributes of HTML FORM
    $sender_email = "sender_email";
    $sender_name = "sender_name";
    $contact = "contactnumber";
    $mail_subject = "subject";
    $input_file = "attachment";
    $message = "description";

    //Fetching HTML Values
    $sender_name = $_POST[$sender_name];
    $sender_mail = $_POST[$sender_email];
    $message = $_POST[$message];
    $contact= $_POST[$contact];
    $mail_subject = $_POST[$mail_subject];

    //Checking if File is uploaded
    if(isset($_FILES[$input_file])) 
    { 
        //Main Content
        $main_subject = "Subject seen on server's mail";
        $main_body = "Hello $server_name,<br><br> 
        $sender_name ,contacted you through your website and the details are as below: <br><br> 
        Name : $sender_name <br> 
        Contact Number : $contact <br> 
        Email : $sender_mail <br> 
        Subject : $mail_subject <br> 
        Message : $message.";

        //Reply Content
        $reply_subject = "Subject seen on sender's mail";
        $reply_body = "Hello $sender_name,<br> 
        \t Thank you for filling the contact form. We will revert back to you shortly.<br><br>
        This is an auto generated mail sent from our Mail Server.<br>
        Please do not reply to this mail.<br>
        Regards<br>
        $server_name";

//#############################DO NOT CHANGE ANYTHING BELOW THIS LINE#############################
        $filename= $_FILES[$input_file]['name'];
        $file = chunk_split(base64_encode(file_get_contents($_FILES[$input_file]['tmp_name'])));
        $uid = md5(uniqid(time()));
        //Sending mail to Server
        $retval = mail($server_mail, $main_subject, "--$uid\r\nContent-type:text/html; charset=iso-8859-1\r\nContent-Transfer-Encoding: 7bit\r\n\r\n $main_body \r\n\r\n--$uid\r\nContent-Type: application/octet-stream; name=\"$filename\"\r\nContent-Transfer-Encoding: base64\r\nContent-Disposition: attachment; filename=\"$filename\"\r\n\r\n$file\r\n\r\n--$uid--", "From: $sender_name <$sender_mail>\r\nReply-To: $sender_mail\r\nMIME-Version: 1.0\r\nContent-Type: multipart/mixed; boundary=\"$uid\"\r\n\r\n");
        //Sending mail to Sender
        $retval = mail($sender_mail, $reply_subject, $reply_body , "From: $server_name<$server_mail>\r\nMIME-Version: 1.0\r\nContent-type: text/html\r\n");
//#############################DO NOT CHANGE ANYTHING ABOVE THIS LINE#############################

        //Output
        if ($retval == true) {
            echo "Message sent successfully...";
            echo "<script>window.location.replace('index.html');</script>";
        } else {
            echo "Error<br>";
            echo "Message could not be sent...Try again later";
            echo "<script>window.location.replace('index.html');</script>";
        }
    }else{
        echo "Error<br>";
        echo "File Not Found";
    }
}else{
    echo "Error<br>";
    echo "Unauthorised Access";
}

由于它们指定的附件格式(application/octet-stream)，上面的答案都不适合我。使用application/pdf可获得pdf文件的最佳效果。

<?php

// just edit these 
$to          = "email1@domain.com, email2@domain.com"; // addresses to email pdf to
$from        = "sent_from@domain.com"; // address message is sent from
$subject     = "Your PDF email subject"; // email subject
$body        = "<p>The PDF is attached.</p>"; // email body
$pdfLocation = "./your-pdf.pdf"; // file location
$pdfName     = "pdf-file.pdf"; // pdf file name recipient will get
$filetype    = "application/pdf"; // type

// creates headers and mime boundary
$eol = PHP_EOL;
$semi_rand     = md5(time());
$mime_boundary = "==Multipart_Boundary_$semi_rand";
$headers       = "From: $from$eolMIME-Version: 1.0$eol" .
    "Content-Type: multipart/mixed;$eol boundary=\"$mime_boundary\"";

// add html message body
$message = "--$mime_boundary$eol" .
    "Content-Type: text/html; charset=\"iso-8859-1\"$eol" .
    "Content-Transfer-Encoding: 7bit$eol$eol$body$eol";

// fetches pdf
$file = fopen($pdfLocation, 'rb');
$data = fread($file, filesize($pdfLocation));
fclose($file);
$pdf = chunk_split(base64_encode($data));

// attaches pdf to email
$message .= "--$mime_boundary$eol" .
    "Content-Type: $filetype;$eol name=\"$pdfName\"$eol" .
    "Content-Disposition: attachment;$eol filename=\"$pdfName\"$eol" .
    "Content-Transfer-Encoding: base64$eol$eol$pdf$eol--$mime_boundary--";

// Sends the email
if(mail($to, $subject, $message, $headers)) {
    echo "The email was sent.";
}
else {
    echo "There was an error sending the mail.";
}