编辑#4
这是另一个不错的版本，似乎更易于使用：
<?php
//define the receiver of the email
$to = 'email@example.com';
//define the subject of the email
$subject = 'Test HTML email';
// Generate a random boundary string
$mime_boundary = '_x'.sha1(time()).'x';
// Using the heredoc syntax to declare the headers
$headers = <<<HEADERS
From: Test <email@example.com>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="PHP-alt$mime_boundary"
HEADERS;
// Use our boundary string to create plain text and HTML versions
$message = <<<MESSAGE
--PHP-alt$mime_boundary
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
This Is a Plain Text Email
This message has no HTML. http://www.google.com
--PHP-alt$mime_boundary
Content-type: text/html; charset=iso-8859-1
Content-Transfer-Encoding: 7bit
<html>
<body>
<h1>This Is an HTML Email</h1>
<p>
This message is composed in <a href="http://www.google.com">GOOGLE, click here</a>.
</p>
</body>
</html>
--PHP-alt$mime_boundary--
MESSAGE;
// Send the message
if(!mail($to, $subject, $message, $headers))
{
// If the mail function fails, return an error message
echo "Something went wrong!";
}
else
{
// Return a success message if nothing went wrong
echo "Message sent successfully. Check your email!";
}
?>
编辑 3
另一种经过测试的方法：（目前为止更好的方法）
<?php
function send_email(
$to='email@example.com',
$from='email@example.com',
$subject='test',
$html_content='<b>HELLO in HTML bold</b>',
$text_content='Hi there in plain text',
$headers='')
{
# Setup mime boundary
$mime_boundary = 'Multipart_Boundary_x'.md5(time()).'x';
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/alternative; boundary=\"$mime_boundary\"\r\n";
$headers .= "Content-Transfer-Encoding: 7bit\r\n";
$body = "This is a multi-part message in mime format.\n\n";
# Add in plain text version
$body .= "--$mime_boundary\n";
$body .= "Content-Type: text/plain; charset=\"charset=us-ascii\"\n";
$body .= "Content-Transfer-Encoding: 7bit\n\n";
$body .= $text_content;
$body .= "\n\n";
# Add in HTML version
$body .= "--$mime_boundary\n";
$body .= "Content-Type: text/html; charset=\"UTF-8\"\n";
$body .= "Content-Transfer-Encoding: 7bit\n\n";
$body .= $html_content;
$body .= "\n\n";
# Attachments would go here
# But this whole email thing should be turned into a class to more logically handle attachments,
# this function is fine for just dealing with html and text content.
# End email
$body .= "--$mime_boundary--\n"; # <-- Notice trailing --, required to close email body for mime's
# Finish off headers
$headers .= "From: $from\r\n";
$headers .= "X-Sender-IP: $_SERVER[SERVER_ADDR]\r\n";
$headers .= 'Date: '.date('n/d/Y g:i A')."\r\n";
# Mail it out
return mail($to, $subject, $body, $headers);
}
send_email(); // call the function
?>
编辑 2
这行得通，并且只在 Gmail 中以 HTML 格式显示，所以理论上纯文本应该可以工作。
<?php
$notice_text = "This is a multi-part message in MIME format.";
$plain_text = "This is a plain text email.\r\nIt is very cool.";
$html_text = "<html><body>This is an <b style='color:purple'>HTML</b>" .
"text email.\r\nIt is very cool.</body></html>";
$semi_rand = md5(time());
$mime_boundary = "==MULTIPART_BOUNDARY_$semi_rand";
$mime_boundary_header = chr(34) . $mime_boundary . chr(34);
$to = "Me <email@example.com>";
// $bcc = "You <you@you.com>, Them <them@them.com>";
$from = "Him <another@example.com>";
$subject = "My Email";
$body = "$notice_text
--$mime_boundary
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
$plain_text
--$mime_boundary
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
$html_text
--$mime_boundary--";
if (@mail($to, $subject, $body,
"From: " . $from . "\n" .
"bcc: " . $bcc . "\n" .
"MIME-Version: 1.0\n" .
"Content-Type: multipart/alternative;\n" .
" boundary=" . $mime_boundary_header))
echo "Email sent successfully.";
else
echo "Email NOT sent successfully!";
?>
编辑 1
试试这个版本：（测试没有任何额外的代码）
<?php
$to = "someone@gmail.com";
$subject = "Test HTML E-mail";
$headers = "From: admin@yellowcas.com" . "\n" . "Reply-To: admin@yellowcas.com" . "\r\n";
$headers .= "MIME-Version: 1.0\r\n";
//unique boundary
$boundary = uniqid("HTMLDEMO");
//tell e-mail client this e-mail contains//alternate versions
$headers .= "Content-Type: multipart/mixed; boundary = $boundary\r\n\r\n";
//plain text version of message
$body = "--$boundary\r\n" .
"Content-Type: text/plain; charset=ISO-8859-1\r\n" .
"Content-Transfer-Encoding: base64\r\n\r\n";
$body .= chunk_split(base64_encode("
Hello, Tom!!!
This is simple text email message.
"));
//HTML version of message
$body .= "--$boundary\r\n" .
"Content-Type: text/html; charset=ISO-8859-1\r\n" .
"Content-Transfer-Encoding: base64\r\n\r\n";
$body .= chunk_split(base64_encode("
<!doctype html>
<head>
<title>Untitled Document</title>
</head>
<body>
<h2>Hello, Tom!</h2>
<p>This is something with <strong>HTML</strong> formatting.</p>
</body>
</html>
"));
ob_start();
?>
<?php
$message = ob_get_clean();
$mail_sent = mail( $to, $subject, $body, $headers );
echo $mail_sent ? "Mail sent" : "Mail failed";
?>
您需要在初始标题中使用以下内容：
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
下面：
$headers .= "MIME-Version: 1.0" . "\n";
根据the manual on PHP.net
已测试（以 HTML 而非代码的形式成功发送到我的 Gmail）
<?php
$to = "someone@gmail.com";
$subject = "Test HTML E-mail";
$random_hash = md5(date("r", time()));
$mID = md5($to);
$headers = "From: admin@yellowcas.com" . "\n" . "Reply-To: admin@yellowcas.com" . "\n";
$headers .= "Errors-To: someone@yahoo.com" . "\n";
$headers .= "MIME-Version: 1.0" . "\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= "Content-Type: multipart/alternative; boundary=". $random_hash ." ; Message-ID: <" . $mID . ">" . "\n";
ob_start();
?>
// rest of code below...