完整邮件发送类

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, $from ,$fromname, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = ""){
 $mail_from = $this->get_address($this->strip_comment($from));
 $body = ereg_replace("(^|( ))(.)", "
.", $body);
 $header .= "MIME-Version:1.0 ";
 if($mailtype=="HTML"){
  $header .= "Content-Type:text/html;charset=utf-8 ";
 }
 $header .= "To: ".$to." ";
 if ($cc != ""){
  $header .= "Cc: ".$cc." ";
 }
 $header .= "From: $fromname<".$fromname."> ";
 $header .= "Subject: ".$subject." ";
 $header .= $additional_headers;
 $header .= "Date: ".date("r")." ";
 $header .= "X-Mailer:By Redhat (PHP/".php教程version().") ";
 list($msec, $sec) = explode(" ", microtime());
 $header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from."> ";
 $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." ");
   $sent = FALSE;
   continue;
  }
  if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)){
   $this->log_write("E-mail has been sent to <".$rcpt_to."> ");
  }else{
   $this->log_write("Error: Cannot send email to <".$rcpt_to."> ");
   $sent = FALSE;
  }
  fclose($this->sock);
  $this->log_write("Disconnected from remote host ");
 }
 return $sent;
}

 /* Private Functions */
 function smtp_send($helo, $from, $to, $header, $body = ""){
  if (!$this->smtp_putcmd("HELO", $helo)){
   return $this->smtp_error("sending HELO command");
  }
  
  #auth
  if($this->auth){
   if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))){
    return $this->smtp_error("sending HELO command");
   }
   if (!$this->smtp_putcmd("", base64_encode($this->pass))){
    return $this->smtp_error("sending HELO command");
   }
  }
  if (!$this->smtp_putcmd("MAIL", "FROM:<".$from.">")){
   return $this->smtp_error("sending MAIL FROM command");
  }
  if (!$this->smtp_putcmd("RCPT", "TO:<".$to.">")){
   return $this->smtp_error("sending RCPT TO command");
  }
  if (!$this->smtp_putcmd("DATA")){
   return $this->smtp_error("sending DATA command");
  }
  if (!$this->smtp_message($header, $body)){
   return $this->smtp_error("sending message");
  }
  if (!$this->smtp_eom()){
   return $this->smtp_error("sending . [EOM]");
  }
  if (!$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." ");
  $this->sock = @fsockopen($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." ");
   $this->log_write("Error: ".$errstr." (".$errno.") ");
   return FALSE;
  }
  $this->log_write("Connected to relay host ".$this->relay_host." ");
  return TRUE;;
 }
 
 function smtp_sockopen_mx($address){
  $domain = ereg_replace("^.+@([^@]+)$", "
", $address);
  if (!@getmxrr($domain, $MXHOSTS)){
   $this->log_write("Error: Cannot resolve MX "".$domain."" ");
   return FALSE;
  }
  foreach ($MXHOSTS as $host){
   $this->log_write("Trying to ".$host.":".$this->smtp_port." ");
   $this->sock = @fsockopen($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." ");
    $this->log_write("Error: ".$errstr." (".$errno.") ");
    continue;
   }
   $this->log_write("Connected to mx host ".$host." ");
   return TRUE;
  }
  $this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).") ");
  return FALSE;
 }

 function smtp_message($header, $body){
  fputs($this->sock, $header." ".$body);
  $this->smtp_debug("> ".str_replace(" ", " "."> ", $header." > ".$body." > "));
  return TRUE;
 }
 
 function smtp_eom(){
  fputs($this->sock, " . ");
  $this->smtp_debug(". [EOM] ");
  return $this->smtp_ok();
 }

 function smtp_ok(){
  $response = str_replace(" ", "", fgets($this->sock, 512));
  $this->smtp_debug($response." ");
  if (!ereg("^[23]", $response)){
   fputs($this->sock, "QUIT ");
   fgets($this->sock, 512);
   $this->log_write("Error: Remote host returned "".$response."" ");
   return FALSE;
  }
  return TRUE;
 }

 function smtp_putcmd($cmd, $arg = ""){
  if($arg != ""){
   if($cmd==""){
    $cmd = $arg;
   }
   else{
    $cmd = $cmd." ".$arg;
   }
  }
  fputs($this->sock, $cmd." ");
  $this->smtp_debug("> ".$cmd." ");
  return $this->smtp_ok();
 }

 function smtp_error($string){
  $this->log_write("Error: Error occurred while ".$string.". ");
  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."" ");
   return FALSE;;
  }
  flock($fp, LOCK_EX);
  fputs($fp, $message);
  fclose($fp);
  return TRUE;
 }

 function strip_comment($address){//去除"()"
  $comment = "([^()]*)";
  while (ereg($comment, $address)){
   $address = ereg_replace($comment, "", $address);
  }
  return $address;
 }

 function get_address($address){
  $address = ereg_replace("([ ])+", "", $address);// 制表符 回车符   换行符  +匹配前面的子表达式一次或多次
  $address = ereg_replace("^.*<(.+)>.*$", "
", $address);
  return $address;
 }

 function smtp_debug($message){
  if ($this->debug){
   echo $message;
  }
 }
}