我想创建一个联系表单，其中电子邮件与自动生成的附件文件（.txt）一起发送。附件应包括联系表单中存在的输入字段的所有值（无论它们是否为空）。这可以通过使用PHP mail（）来完成吗？我的代码现在只能将联系表单内容作为电子邮件正文发送：
<?php
define("WEBMASTER_EMAIL", 'info@email.com');
error_reporting (E_ALL);
if(!empty($_POST))
{
$_POST = array_map('trim', $_POST);
$name = htmlspecialchars($_POST['name']);
$email = $_POST['email'];
$subject = htmlspecialchars($_POST['subject']);
$message = htmlspecialchars($_POST['message']);
$error = array();
if(empty($name))
{
$error[] = 'Please enter your name';
}
if(empty($email))
{
$error[] = 'Please enter your e-mail';
}
elseif(!filter_var($email, FILTER_VALIDATE_EMAIL))
{
$error[] = 'e-mail is incorrect';
}
if(empty($message) || empty($message{15}))
{
$error[] = "Please enter message more than 15 characters";
}
if(empty($error))
{
$body = '
<html>
<head>
<title></title>
</head>
<body>
<table>
<tr><td>Name: </td><td> </td><td>'.$name.'</td><tr>
<tr><td> </td><td> </td><td> </td></tr>
<tr><td>Email: </td><td> </td><td>'.$email.'</td><tr>
<tr><td> </td><td> </td><td> </td></tr>
<tr><td>Subject: </td><td> </td><td>'.$subject.'</td><tr>
<tr><td> </td><td> </td><td> </td></tr>
<tr><td>Message: </td><td> </td><td>'.stripslashes($message).'</td><tr>
</table>
</body>
</html>
';
$mail = mail(WEBMASTER_EMAIL, 'Message sent from website', $body,
"MIME-Version: 1.0" . "\r\n"
."Content-type: text/html; charset=UTF-8" . "\r\n"
."From: ".$email." \r\n"
."Reply-To: ".$email."\r\n"
."X-Mailer: PHP/" . phpversion());
if($mail)
{
echo 'OK';
}
}
else
{
echo '<div class="notification_error">'.implode('<br />', $error).'</div>';
}
}
?>