Send smtp mail in php with HTML page attach as a text

I have a requirement of sending mail using smtp server in php.

Now I am able to send the mail using smtp for a plain text.

but I have a requirement where I need to attach an HTML page, which includes set of images.

Now for that I am trying the following code :

<?php
require_once "Mail.php";
$to      = 'test@test.com';
$from    = 'test@test.com';
$subject = $_POST['subject'];
$body = $_POST['message'];

$fileatt      = $_FILES['fileatt']['tmp_name'];
$fileatt_type = $_FILES['fileatt']['type'];
$fileatt_name = $_FILES['fileatt']['name'];

$headers = array ('From' => $from,
   'To' => $to,
   'Subject' => $subject);

if (is_uploaded_file($fileatt)) {
    echo("<p>Inside 1</p>");
    $file = fopen($fileatt,'rb');
    $data = fread($file,filesize($fileatt));
    fclose($file);

    // Generate a boundary string
    $semi_rand = md5(time());
    $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";

    array_push(&$headers, 'MIME-Version: 1.0');
    array_push(&$headers, 'Content-Type: multipart/mixed;');
    array_push(&$headers, " boundary=\"{$mime_boundary}\"");

    echo("<p>Inside 2</p>");

    $body = "This is a multi-part message in MIME format.\n\n" .
             "--{$mime_boundary}\n" .
             "Content-Type: text/plain; charset=\"iso-8859-1\"\n" .
             "Content-Transfer-Encoding: 7bit\n\n" .
    $body . "\n\n";

    echo("<p>Inside 3</p>");

    $data = chunk_split(base64_encode($data));

    echo("<p>Inside 4</p>");

    $body .= "--{$mime_boundary}\n" .
              "Content-Type: {$fileatt_type};\n" .
              " name=\"{$fileatt_name}\"\n" .
              "Content-Transfer-Encoding: base64\n\n" .
    $data . "\n\n" .
              "--{$mime_boundary}--\n";

    echo("<p>Inside 5</p>");
}
$host = "user@test.com";
$username = "user@test.com";
$password = "user";
$smtp = Mail::factory('smtp',
    array ('host' => $host,
     'auth' => true,
     'username' => $username,
     'password' => $password));

$mail = $smtp->send($to, $headers, $body);
if (PEAR::isError($mail)) {
    echo("<p>" . $mail->getMessage() . "</p>");
} else {
    echo("<p>Message successfully sent!</p>");
}
?>

Now this code works fine for me, and it's sending the mail to the target email address.

But when I open this email in the inbox, it's showing me the following text in the mailbox:

This is a multi-part message in MIME format.

--==Multipart_Boundary_x368d72fe1ff44518e90537abdb4bf029x
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

test 1011

--==Multipart_Boundary_x368d72fe1ff44518e90537abdb4bf029x
Content-Type: text/html;
 name="mailing.html"
Content-Transfer-Encoding: base64

PCFET0NUWVBFIGh0bWwgUFVCTE开发者_如何学编程lDICItLy9XM0MvL0RURCBYSFRNTCAxLjAgVHJhbnNpdGlvbmFs
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--==Multipart_Boundary_x368d72fe1ff44518e90537abdb4bf029x--

So, it's clearly showing me the encoded data.

So, what should modify to send the proper html page that should be visible in targeted email's inbox?

Why do you want to reinvent the wheel? There's lots of different implementations that allow you to send HTML mail with attachments, ie. Zend_Mail, PHPMailer, ... . Use one of these, and save yourself from headaches.