php写的发送附件的程序(二)
<?php
class html_mime_mail{

var $headers;
var $body;
var $multipart;
var $mime;
var $html;
var $html_text;
var $html_images = array();
var $cids = array();
var $do_html;
var $parts = array();

/***************************************
** Constructor function. Sets the headers
** if supplied.
***************************************/
function html_mime_mail($headers = ''){
$this->headers = $headers;
}

/***************************************
** Adds a html part to the mail.
** Also replaces image names with
** content-id's.
***************************************/
function add_html($html, $text){
$this->do_html = 1;
$this->html = $html;
$this->html_text = $text;
if(is_array($this->html_images) AND count($this->html_images) > 0){
for($i=0; $i<count($this->html_images); $i++){
$this->html = ereg_replace($this->html_images[$i]['name'], 'cid:'.$this->html_images[$i]['cid'], $this->html);
}
}
}

/***************************************
** Builds html part of email.
***************************************/
function build_html($orig_boundary){
$sec_boundary = '=_'.md5(uniqid(time()));
$thr_boundary = '=_'.md5(uniqid(time()));

if(!is_array($this->html_images)){
$this->multipart.= '--'.$orig_boundary."\r\n";
$this->multipart.= 'Content-Type: multipart/alternative; boundary="'.$sec_boundary."\"\r\n\r\n\r\n";

$this->multipart.= '--'.$sec_boundary."\r\n";
$this->multipart.= 'Content-Type: text/plain'."\r\n";
$this->multipart.= 'Content-Transfer-Encoding: 7bit'."\r\n\r\n";
$this->multipart.= $this->html_text."\r\n\r\n";

$this->multipart.= '--'.$sec_boundary."\r\n";
$this->multipart.= 'Content-Type: text/html'."\r\n";
$this->multipart.= 'Content-Transfer-Encoding: 7bit'."\r\n\r\n";
$this->multipart.= $this->html."\r\n\r\n";
$this->multipart.= '--'.$sec_boundary."--\r\n\r\n";
}else{
$this->multipart.= '--'.$orig_boundary."\r\n";
$this->multipart.= 'Content-Type: multipart/related; boundary="'.$sec_boundary."\"\r\n\r\n\r\n";

$this->multipart.= '--'.$sec_boundary."\r\n";
$this->multipart.= 'Content-Type: multipart/alternative; boundary="'.$thr_boundary."\"\r\n\r\n\r\n";

$this->multipart.= '--'.$thr_boundary."\r\n";
$this->multipart.= 'Content-Type: text/plain'."\r\n";
$this->multipart.= 'Content-Transfer-Encoding: 7bit'."\r\n\r\n";
$this->multipart.= $this->html_text."\r\n\r\n";

$this->multipart.= '--'.$thr_boundary."\r\n";
$this->multipart.= 'Content-Type: text/html'."\r\n";
$this->multipart.= 'Content-Transfer-Encoding: 7bit'."\r\n\r\n";
$this->multipart.= $this->html."\r\n\r\n";
$this->multipart.= '--'.$thr_boundary."--\r\n\r\n";

for($i=0; $i<count($this->html_images); $i++){
$this->multipart.= '--'.$sec_boundary."\r\n";
$this->build_html_image($i);
}

$this->multipart.= "--".$sec_boundary."--\r\n\r\n";
}
}
/***************************************
** Adds an image to the list of embedded
** images.
***************************************/
function add_h