在线邮件发送，SMTP类

<?php
/**
//******************************
//发送示例
require ("smtp.php");
$smtpserver = "smtp.163.com";//SMTP服务器
$smtpserverport =25;//SMTP服务器端口
$smtpusermail = "XXXXX@163.com";//SMTP服务器的用户邮箱
$smtpemailto = "XXX@XXX.net";//发送给谁
$smtpuser = "XXXXX";//SMTP服务器的用户帐号
$smtppass = "XXXXX";//SMTP服务器的用户密码
$mailsubject = "Test Subject";//邮件主题
$mailbody = "<h1>This is a test mail</h1>";//邮件内容
$mailtype = "HTML";//邮件格式（HTML/TXT）,TXT为文本邮件
$smtp = new smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppass);//这里面的一个true是表示使用身份验证,否则不使用身份验证.
$smtp->debug = TRUE;//是否显示发送的调试信息
$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype);
//******************************
*/
class smtp
{

/* Public Variables */
    var $smtp_port;
    var $time_out;
    var $host_name;
    var $log_file;
    var $relay_host;
    var $debug;
    var $auth;
    var $user;
    var $pass;
    /* Private Variables */
    var $sock;
    /* Constractor */
    function smtp($relay_host = "", $smtp_port = 25,$auth = false,$user,$pass)
    {
        $this->debug = FALSE;
        $this->smtp_port = $smtp_port;
        $this->relay_host = $relay_host;
        $this->time_out = 30; //is used in fsockopen()

        #
        $this->auth = $auth;//auth
        $this->user = $user;
        $this->pass = $pass;

        #
        $this->host_name = "localhost"; //is used in HELO command
        $this->log_file = "";

$this->sock = FALSE;

}
    /* Main Function */
    function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "")
    {
        $mail_from = $this->get_address($this->strip_comment($from));
        $body = ereg_replace("(^|(/r/n))(/.)", "/1./3", $body);
        $header = "MIME-Version:1.0/r/n";
        if($mailtype=="HTML"){
            $header .= "Content-Type:text/html/r/n";
        }
        $header .= "To: ".$to."/r/n";
        if ($cc != "") {
            $header .= "Cc: ".$cc."/r/n";
        }
        $header .= "From: $from<".$from.">/r/n";
        $header .= "Subject: ".$subject."/r/n";
        $header .= $additional_headers;
        $header .= "Date: ".date("r")."/r/n";
        $header .= "X-Mailer:By Redhat (PHP/".phpversion().")/r/n";
        list($msec, $sec) = explode(" ", microtime());
        $header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from.">/r/n";
        $TO = explode(",", $this->strip_comment($to));
        if ($cc != "") {
            $TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
        }

if ($bcc != "") {
            $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
        }
        $sent = TRUE;
        foreach ($TO as $rcpt_to) {
            $rcpt_to = $this->get_address($rcpt_to);

            if (!$this->smtp_sockopen($rcpt_to)) {
                $this->log_write("Error: Cannot send email to ".$rcpt_to."/n");
                $sent = FALSE;
                continue;
            }
            if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
                $this->log_write("E-mail has been sent to <".$rcpt_to.">/n");
            } else {
                $this->log_write("Error: Cannot send email to <".$rcpt_to.">/n");
                $sent = FALSE;
            }
            fclose($this->sock);
            $this->log_write("Disconnected from remote host/n");
        }
        return $sent;
    }

/* Private Functions */

if (!$this->smtp_message($header, $body)) {

return $this->smtp_error("sending message");

}

if (!$this->smtp_eom()) {

return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");

}

if (!$this->smtp_putcmd("QUIT")) {

return $this->smtp_error("sending QUIT command");

}

return TRUE;

}

function smtp_sockopen($address)

{

if ($this->relay_host == "") {

return $this->smtp_sockopen_mx($address);

} else {

return $this->smtp_sockopen_relay();

}

function smtp_sockopen_relay()

{

$this->log_write("Trying to ".$this->relay_host.":".$this->smtp_port."/n");

$this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);

if (!($this->sock && $this->smtp_ok())) {

$this->log_write("Error: Cannot connenct to relay host ".$this->relay_host."/n");

$this->log_write("Error: ".$errstr." (".$errno.")/n");

return FALSE;

}

$this->log_write("Connected to relay host ".$this->relay_host."/n");

return TRUE;

}

function smtp_sockopen_mx($address)

{

$domain = ereg_replace("^.+@([^@]+)$", "/1", $address);

if (!@getmxrr($domain, $MXHOSTS)) {

$this->log_write("Error: Cannot resolve MX /"".$domain."/"/n");

return FALSE;

}

foreach ($MXHOSTS as $host) {

$this->log_write("Trying to ".$host.":".$this->smtp_port."/n");

$this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);

if (!($this->sock && $this->smtp_ok())) {

$this->log_write("Warning: Cannot connect to mx host ".$host."/n");

$this->log_write("Error: ".$errstr." (".$errno.")/n");

continue;

}

$this->log_write("Connected to mx host ".$host."/n");

return TRUE;

}

$this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).")/n");

return FALSE;

}

function smtp_message($header, $body)

{

fputs($this->sock, $header."/r/n".$body);

$this->smtp_debug("> ".str_replace("/r/n", "/n"."> ", $header."/n> ".$body."/n> "));

return TRUE;

}

function smtp_eom()

{

fputs($this->sock, "/r/n./r/n");

$this->smtp_debug(". [EOM]/n");

return $this->smtp_ok();

}

function smtp_ok()

{

$response = str_replace("/r/n", "", fgets($this->sock, 512));

$this->smtp_debug($response."/n");

if (!ereg("^[23]", $response)) {

fputs($this->sock, "QUIT/r/n");

fgets($this->sock, 512);

$this->log_write("Error: Remote host returned /"".$response."/"/n");

return FALSE;

}

return TRUE;

}

function smtp_putcmd($cmd, $arg = "")

{

if ($arg != "") {

if($cmd=="") $cmd = $arg;

else $cmd = $cmd." ".$arg;

}

fputs($this->sock, $cmd."/r/n");

$this->smtp_debug("> ".$cmd."/n");

return $this->smtp_ok();

}

function smtp_error($string)

{

$this->log_write("Error: Error occurred while ".$string."./n");

return FALSE;

}

function log_write($message)

{

$this->smtp_debug($message);

if ($this->log_file == "") {

return TRUE;

}

$message = date("M d H:i:s ").get_current_user()."[".getmypid()."]: ".$message;

if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {

$this->smtp_debug("Warning: Cannot open log file /"".$this->log_file."/"/n");

return FALSE;;

}

flock($fp, LOCK_EX);

fputs($fp, $message);

fclose($fp);

return TRUE;

}

function strip_comment($address)

{

$comment = "/([^()]*/)";

while (ereg($comment, $address)) {

$address = ereg_replace($comment, "", $address);

}

return $address;

}

function get_address($address)

{

$address = ereg_replace("([ /t/r/n])+", "", $address);

$address = ereg_replace("^.*<(.+)>.*$", "/1", $address);

return $address;

}

function smtp_debug($message)

{

if ($this->debug) {

echo $message;

}

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