php实现在站点里面添加邮件发送的功能

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            下面夏日博客来讲下如何在站点里面添加一个邮件发送的功能。
首先需要下载一个smtp 的 php 邮件发送类，代码如下:
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 = preg_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\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: \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 \n");
      } else {
        $this->log_write("Error: Cannot send email to \n");
        $sent = FALSE;
      }
      fclose($this->sock);
      $this->log_write("Disconnected from remote host\n");
    }
    echo "
";
    //echo $header;
    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:")) {
      return $this->smtp_error("sending MAIL FROM command");
    }
     
    if (!$this->smtp_putcmd("RCPT", "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."\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)
  {
    $domain = preg_replace("/^.+@([^@]+)$/", "\\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 (!preg_match("/^[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)
  {
    $comment = "/\\([^()]*\\)/";
    while (preg_match($comment, $address)) {
      $address = preg_replace($comment, "", $address);
    }
     
    return $address;
  }

  function get_address($address)
  {
    $address = preg_replace("/([ \t\r\n])+/", "", $address);
    $address = preg_replace("/^.*.*$/", "\\1", $address);
     
    return $address;
  }

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

function get_attach_type($image_tag) { //

  $filedata = array();
   
  $($image_tag,"r");
  unset($image_data);
  while ($tem_buffer=AddSlashes(fread($,filesize($image_tag))))
  $image_data.=$tem_buffer;
  fclose($);

  $filedata['context'] = $image_data;
  $filedata['filename']= basename($image_tag);
  $extension=substr($image_tag,strrpos($image_tag,"."),strlen($image_tag)-strrpos($image_tag,"."));
  switch($extension){
    case ".gif":
      $filedata['type'] = "image/gif";
      break;
    case ".gz":
      $filedata['type'] = "application/x-gzip";
      break;
    case ".htm":
      $filedata['type'] = "text/html";
      break;
    case ".html":
      $filedata['type'] = "text/html";
      break;
    case ".jpg":
      $filedata['type'] = "image/jpeg";
      break;
    case ".tar":
      $filedata['type'] = "application/x-tar";
      break;
    case ".txt":
      $filedata['type'] = "text/plain";
      break;
    case ".zip":
      $filedata['type'] = "application/zip";
      break;
    default:
      $filedata['type'] = "application/octet-stream";
      break;
  }
  return $filedata;
  }

} // end class
?>