带有文件上传附件的 PHP 联系表

我有一个简单的PHP联系表格（见这里），我想添加一个文件上传选项，这样客户就可以附加一个重要的文档，并使用PHP的邮件功能将其邮寄给我。

表单本身工作正常，但我似乎无法正确获取上传附件的代码，将其临时存储在服务器上并将其作为电子邮件的一部分发送给我。这是我正在使用的代码：

<?php
if ($_POST['test'] != '') {
    echo 'Unfortunately, by filling out the hidden field, you have been identified as a potential spambot and your message has been terminated.';
} else {
//Validate the name:
if (!empty($_POST['name'])) {
    $name = $_POST['name'];
} else {
    echo "You forgot to enter your name.<br>";
}
//Validate the phone:
if (!empty($_POST['phone'])) {
    $phone = $_POST['phone'];
} else {
    echo "You forgot to enter your phone number.<br>";
}
//Validate the e-mail:
if (!empty($_POST['email'])) {
    $email = $_POST['email'];
} else {
    echo "You forgot to enter your e-mail.<br>";
}
//Validate the message:
if (!empty($_POST['message'])) {
    $message = $_POST['message'];
} else {
    echo "You forgot to enter a message.";
}
if (!empty($_POST['name']) && !empty($_POST['phone']) && !empty($_POST['email']) && !empty($_POST['message'])) {
    // Obtain file upload variables:
    $attachment = $_FILES['attachment']['tmp_name']; 
    $attachment_type = $_FILES['attachment']['type']; 
    $attachment_name = $_FILES['attachment']['name'];
    if (file($attachment)) { 
    // Read the file to be attached ('rb' = read binary):
    $file = fopen($attachment,'rb'); 
    $data = fread($file,filesize($attachment)); 
    fclose($file);
    // Generate a boundary string:
    $semi_rand = md5(time()); 
    $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x"; 
    // Add the headers for a file attachment:
    $headers = "'nMIME-Version: 1.0'n" . 
    "Content-Type: multipart/mixed;'n" . 
    " boundary='"{$mime_boundary}'"";
    // Add a multipart boundary above the plain message:
    $message = "This is a multi-part message in MIME format.'n'n" . 
    "--{$mime_boundary}'n" . 
    "Content-Type: text/plain; charset='"iso-8859-1'"'n" . 
    "Content-Transfer-Encoding: 7bit'n'n" . 
    $message . "'n'n";
    // Base64 encode the file data:
    $data = chunk_split(base64_encode($data));  
    // Add file attachment to the message:
    $message .= "--{$mime_boundary}'n" . 
    "Content-Type: {$attachment_type};'n" . 
    " name='"{$attachment_name}'"'n" . 
    //"Content-Disposition: attachment;'n" . 
    //" filename='"{$attachment_name}'"'n" . 
    "Content-Transfer-Encoding: base64'n'n" . 
    $data . "'n'n" . 
    "--{$mime_boundary}--'n"; 
    }  
    $body = "$name'n$phone'n$email'n'n$message";
    mail("*@*.com", "Starcrest Escrow, Inc. Website - Real Property Sale", $body, $headers);
    header("Location: confirm.html");
}
}
?>

当我目前运行此脚本时，它会将我转发到确认页面，但似乎根本没有生成任何电子邮件。 我做错了什么？