<?php

define('SMTP_STATUS_NOT_CONNECTED', 1, TRUE);
define('SMTP_STATUS_CONNECTED', 2, TRUE);

class smtp
{

var $connection;
var $recipients;
var $headers;
var $timeout;
var $errors;
var $status;
var $body;
var $from;
var $host;
var $port;
var $helo;
var $auth;
var $user;
var $pass;
var $debug;

/**
* 参数为一个数组
* host SMTP 服务器的主机 默认：localhost
* port SMTP 服务器的端口 默认：25
* helo 发送HELO命令的名称 默认：localhost
* user SMTP 服务器的用户名 默认：空值
* pass SMTP 服务器的登陆密码 默认：空值
* timeout 连接超时的时间 默认：5
* @return bool
*/

function smtp($params = array())
{

if(!defined('CRLF')) define('CRLF', “\r\n”, TRUE);

$this->timeout = 5;
$this->status = SMTP_STATUS_NOT_CONNECTED;
$this->host = ‘localhost';
$this->port = 25;
$this->auth = FALSE;
$this->user = ”;
$this->pass = ”;
$this->errors = array();
$this->debug = false;
foreach($params as $key => $value)
{
$this->$key = $value;
}

$this->helo = $this->host;

// 如果没有设置用户名则不验证
$this->auth = (” == $this->user) ? FALSE : TRUE;
}

function connect($params = array())
{

if(!isset($this->status))
{
$obj = new smtp($params);

if($obj->connect())
{
$obj->status = SMTP_STATUS_CONNECTED;
}

return $obj;

}
else
{

$this->connection = fsockopen($this->host, $this->port, $errno, $errstr, $this->timeout);
socket_set_timeout($this->connection, 0, 250000);

$greeting = $this->get_data();

if(is_resource($this->connection))
{
$this->status = 2;
return $this->auth ? $this->ehlo() : $this->helo();
}
else
{
$this->errors[] = ‘Failed to connect to server: ‘.$errstr;
return FALSE;
}
}
}

/**
* 参数为数组
* recipients 接收人的数组
* from 发件人的地址，也将作为回复地址
* headers 头部信息的数组
* body 邮件的主体
*/

function send($params = array())
{

foreach($params as $key => $value)
{
$this->set($key, $value);
}

if($this->is_connected())
{
// 服务器是否需要验证
if($this->auth)
{
if(!$this->auth()) return FALSE;
}

$this->mail($this->from);

if(is_array($this->recipients))
{
foreach($this->recipients as $value)
{
$this->rcpt($value);
}
}
else
{
$this->rcpt($this->recipients);
}

if(!$this->data()) return FALSE;

$headers = str_replace(CRLF.'.', CRLF.'..', trim(implode(CRLF, $this->headers)));
$body = str_replace(CRLF.'.', CRLF.'..', $this->body);
$body = $body[0] == ‘.' ? ‘.'.$body : $body;

$this->send_data($headers);
$this->send_data(”);
$this->send_data($body);
$this->send_data('.');

return (substr(trim($this->get_data()), 0, 3) === ‘250′);
}
else
{
$this->errors[] = ‘Not connected!';
return FALSE;
}
}

function helo()
{
if(is_resource($this->connection)
AND $this->send_data('HELO ‘.$this->helo)
AND substr(trim($error = $this->get_data()), 0, 3) === ‘250′ )
{
return TRUE;

}
else
{
$this->errors[] = ‘HELO command failed, output: ‘ . trim(substr(trim($error),3));
return FALSE;
}
}

function ehlo()
{
if(is_resource($this->connection)
AND $this->send_data('EHLO ‘.$this->helo)
AND substr(trim($error = $this->get_data()), 0, 3) === ‘250′ )
{
return TRUE;
}
else
{
$this->errors[] = ‘EHLO command failed, output: ‘ . trim(substr(trim($error),3));
return FALSE;
}
}

function auth()
{
if(is_resource($this->connection)
AND $this->send_data('AUTH LOGIN')
AND substr(trim($error = $this->get_data()), 0, 3) === ‘334′
AND $this->send_data(base64_encode($this->user)) // Send username
AND substr(trim($error = $this->get_data()),0,3) === ‘334′
AND $this->send_data(base64_encode($this->pass)) // Send password
AND substr(trim($error = $this->get_data()),0,3) === ‘235′ )
{
return TRUE;
}
else
{
$this->errors[] = ‘AUTH command failed: ‘ . trim(substr(trim($error),3));
return FALSE;
}
}

function mail($from)
{

if($this->is_connected()
AND $this->send_data('MAIL FROM:<'.$from.'>')
AND substr(trim($this->get_data()), 0, 2) === ‘250′ )
{
return TRUE;
}
else
{
return FALSE;
}
}

function rcpt($to)
{
if($this->is_connected()
AND $this->send_data('RCPT TO:<'.$to.'>')
AND substr(trim($error = $this->get_data()), 0, 2) === ‘25′ )
{
return TRUE;
}
else
{
$this->errors[] = trim(substr(trim($error), 3));
return FALSE;
}
}

function data()
{

if($this->is_connected()
AND $this->send_data('DATA')
AND substr(trim($error = $this->get_data()), 0, 3) === ‘354′ )
{
return TRUE;
}
else
{
$this->errors[] = trim(substr(trim($error), 3));
return FALSE;
}
}

function is_connected()
{
return (is_resource($this->connection) AND ($this->status === SMTP_STATUS_CONNECTED));
}

function send_data($data)
{
if(is_resource($this->connection))
{
if($this->debug)
echo nl2br($data.CRLF);
return fwrite($this->connection, $data.CRLF, strlen($data)+2);
}
else
{
return FALSE;
}
}

function &get_data()
{

$return = ”;
$line = ”;

if(is_resource($this->connection))
{
while(strpos($return, CRLF) === FALSE OR substr($line,3,1) !== ‘ ‘)
{
$line = fgets($this->connection, 512);
$return .= $line;
}
if($this->debug===true)
echo nl2br($return.CRLF);
return $return;

}
else
{
return FALSE;
}
}

function set($var, $value)
{
$this->$var = $value;
return TRUE;
}
} // End of class
?>