php通过smtp发送邮件需要通过一个类smtp

发邮件的代码如下：

require_once 'smtp.php';    ##########################################   $smtpserver = "smtp.sina.com";//SMTP服务器   $smtpserverport = 25;//SMTP服务器端口   $smtpusermail = "god_chen@sina.com";//SMTP服务器的用户邮箱   $smtpemailto = "45323333@qq.com";//发送给谁   $smtpuser = "name";//SMTP服务器的用户帐号   $smtppass = "123456";//SMTP服务器的用户密码   $mailsubject = "中文";//邮件主题   $mailbody = "<h1>中文</h1>测试下能淤泥新年感";//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 = FALSE;//是否显示发送的调试信息   $smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype)

smtp类的源码如下：

<?php  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 $sent;   }     /* Private Functions */   function smtp_send($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 $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");    }    if (!$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;  }  }    }