php：smtp方式或mail函数方式发送邮件

php实现的邮件发送类，二种方式：
smtp方式与mail函数方式。

代码：

<?php
/**
* 邮件发送类
*/
Class sendmail{
    public $smtp_host;
    public $smtp_port = 25;
    public $smtp_user;
    public $smtp_password;
    public $from_name;
    public $SendFromMail;
    public $mail_to;
    public $subject;
    public $message;
    public $headers = &#39;&#39;;
    public $ContentType = &#39;html&#39;;
    public $charset = &#39;windows-1251&#39;;
    public $smtp_debug = true;
    public $socket;
    public $error;
    public $SendMailVia  = &#39;smtp&#39;;

  public function construct()
    {
            if($this->SendFromMail == &#39;&#39;){
               $this->SendFromMail = $this->smtp_user;
            }
    }

    public function Send($mail_to = &#39;&#39;, $subject = &#39;&#39;, $message = &#39;&#39;)
    {
        if($mail_to!=&#39;&#39;){$this->mail_to = stripslashes($mail_to);}
            if($subject!=&#39;&#39;){$this->subject = stripslashes($subject);}
            if($message!=&#39;&#39;){$this->message = $message;}
            $meilsArr = array_filter($this->GetMailAndNameArr());
            if(trim($this->mail_to)==&#39;&#39;){$this->error = &#39;Enter the recipient address&#39;; }
            if($meilsArr == array()){$this->error = &#39;Please enter a valid recipient address&#39;; }
            foreach ($meilsArr as $val)
            {
                $validEmail = $this->validEmail($val[2]);
                if($validEmail)
                {
                  if($this->SendMailVia==&#39;smtp&#39;){
                      return $this->SMTPsend($mail_to = $val[2], $name_to = $val[1]);
                    }
                    else{
                      return $this->MAILsend($mail_to = $val[2], $name_to = $val[1]);
                    }
                }
            }
    }

    public function MAILsend($mail_to, $name_to)
    {
    if($this->ContentType=="text"){
        $header="Content-Type: text/plain; charset=".$this->charset."";
      }
        else{
        $header="Return-Path: ".$this->smtp_user."\n".
      "Reply-To: ".$this->SendFromMail."\n".
      "From: ".$this->from_name." <".$this->SendFromMail.">\n".
      "Subject: ".$this->subject."\n".
        "Content-Type: text/html; charset=".$this->charset."\n";
      }
      if(mail("$name_to <$mail_to>",$this->subject,$this->message,$header)){
         return true;
        }else{
         return false;
        }
  }

    public function SMTPsend($mail_to, $name_to)
    {
            $SEND =   "Date: ".date("D, d M Y H:i:s") . "\r\n";
            $SEND .=   &#39;Subject: =?&#39;.$this->charset.&#39;?B?&#39;.base64_encode($this->subject)."=?=\r\n";
            if ($this->headers!=&#39;&#39;){ $SEND .= $this->headers."\r\n\r\n"; }
      else
      {
         $SEND .= "Reply-To: ".$this->SendFromMail."\r\n";
         $SEND .= "MIME-Version: 1.0\r\n";
         $SEND .= "Content-Type: text/".$this->ContentType."; charset=\"".$this->charset."\"\r\n";
         $SEND .= "Content-Transfer-Encoding: 8bit\r\n";
         $SEND .= "From: \"".$this->from_name."\" <".$this->SendFromMail.">\r\n";
         $SEND .= "To: $name_to <$mail_to>\r\n";
         $SEND .= "X-Priority: 3\r\n\r\n";
      }
      $SEND .=  $this->message."\r\n";

                $socket = fsockopen($this->smtp_host, $this->smtp_port, $errno, $errstr, 30);
          if(!socket)
            {
          if($this->smtp_debug) $this->error = $errno." - ".$errstr;
          return false;
        }

                if (!$this->server_parse($socket, "220", LINE)){ return false; }

            fputs($socket, "HELO ".$this->smtp_host. "\r\n");
            if (!$this->server_parse($socket, "250", LINE)) {
               if ($this->smtp_debug) $this->error = &#39;<p>Can not send HELO!</p>&#39;;
               fclose($socket);
               return false;
            }
            fputs($socket, "AUTH LOGIN\r\n");
            if (!$this->server_parse($socket, "334", LINE)) {
               if ($this->smtp_debug) $this->error = &#39;<p>Can not find an answer to a request authorization.</p>&#39;;
               fclose($socket);
               return false;
            }
            fputs($socket, base64_encode($this->smtp_user) . "\r\n");
            if (!$this->server_parse($socket, "334", LINE)) {
               if ($this->smtp_debug) $this->error = &#39;<p>Login authorization was not accepted by server!</p>&#39;;
               fclose($socket);
               return false;
            }
            fputs($socket, base64_encode($this->smtp_password) . "\r\n");
            if (!$this->server_parse($socket, "235", LINE)) {
               if ($this->smtp_debug) $this->error = &#39;<p>No password was not accepted as a true server! Authorization Error!</p>&#39;;
               fclose($socket);
               return false;
            }
            fputs($socket, "MAIL FROM: <".$this->smtp_user.">\r\n");
            if (!$this->server_parse($socket, "250", LINE)) {
               if ($this->smtp_debug) $this->error = &#39;<p>Unable to send command MAIL FROM: </p>&#39;;
               fclose($socket);
               return false;
            }
            fputs($socket, "RCPT TO: <" . $mail_to . ">\r\n");
            if (!$this->server_parse($socket, "250", LINE)) {
               if ($this->smtp_debug) $this->error = &#39;<p>Unable to send command RCPT TO: </p>&#39;;
               fclose($socket);
               return false;
            }
            fputs($socket, "DATA\r\n");
            if (!$this->server_parse($socket, "354", LINE)) {
               if ($this->smtp_debug) $this->error = &#39;<p>Unable to send command DATA</p>&#39;;
               fclose($socket);
               return false;
            }
            fputs($socket, $SEND."\r\n.\r\n");
            if (!$this->server_parse($socket, "250", LINE)) {
               if ($this->smtp_debug) $this->error = &#39;<p>Unable to send the message body. The letter was sent!</p>&#39;;
               fclose($socket);
               return false;
            }
            fputs($socket, "QUIT\r\n");
            fclose($socket);
            return TRUE;
    }

    private function GetMailAndNameArr(){
        $mailingArr = array();
            $tos = preg_split("/;|,/",$this->mail_to);
            $pregcode = &#39;/(.*?)<(.*?)>/i&#39;;
            foreach($tos as $to)
            {
              if(preg_match(&#39;/(.*?)<(.*?)>/i&#39;,$to,$matches))
                {
                  unset($matches[0]);
                  $matches[1] = trim(str_replace(&#39;"&#39;,&#39;&#39;,$matches[1]));
                  $matches[2] = trim($matches[2]);
                  $mailingArr[] =$matches;
                }
                elseif(preg_match(&#39;/\b([A-Z0-9._%-]+)@([A-Z0-9.-]+\.[A-Z]{2,4})\b/i&#39;,$to,$matches2))
                {
                     unset($matches[0]);
                     $matches[1] = trim(str_replace(&#39;"&#39;,&#39;&#39;,$matches2[1]));
                     $matches[2] = trim($matches2[0]);
                     $mailingArr[] =$matches;
                }
            }
            return $mailingArr;
    }

    private function server_parse($socket, $response, $line = LINE) {
    while (substr($server_response, 3, 1) != &#39; &#39;) {
          if (!($server_response = fgets($socket, 256))) {
               if ($this->smtp_debug) $this->error = "<p>$line Problems sending mail! $response</p>";
               return false;
          }
    }
    if (!(substr($server_response, 0, 3) == $response)) {
           if ($this->smtp_debug) $this->error = "<p>$line Problems sending mail! $response</p>";
           return false;
        }
    return true;
  }
  function validEmail($email)
  {
    $isValid = true;
    $atIndex = strrpos($email, "@");
      $msg = &#39;&#39;;
    if (is_bool($atIndex) && !$atIndex)
    {
      $isValid = false;
    }
    else
    {
      $domain = substr($email, $atIndex+1);
      $local = substr($email, 0, $atIndex);
      $localLen = strlen($local);
      $domainLen = strlen($domain);
      if ($localLen < 1 || $localLen > 64){
                 $msg = &#39;local part length exceeded&#39;;
         $isValid = false;
      }
      else if ($domainLen < 1 || $domainLen > 255){
                 $msg = &#39; domain part length exceeded &#39;;
         $isValid = false;
      }
      else if ($local[0] == &#39;.&#39; || $local[$localLen-1] == &#39;.&#39;){
                 $msg = &#39; local part starts or ends with .&#39;;
         $isValid = false;
      }
      else if (preg_match(&#39;/\\.\\./&#39;, $local)){
                 $msg = &#39;local part has two consecutive dots&#39;;
         $isValid = false;
      }
      else if (!preg_match(&#39;/^[A-Za-z0-9\\-\\.]+$/&#39;, $domain)){
                 $msg = &#39;character not valid in domain part&#39;;
         $isValid = false;
      }
      else if (preg_match(&#39;/\\.\\./&#39;, $domain)){
                 $msg = &#39;  domain part has two consecutive dots&#39;;
         $isValid = false;
      }
      else if(!preg_match(&#39;/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\&#39;*+?^{}|~.-])+$/&#39;, str_replace("\\\\","",$local))){
                 $msg = &#39;  character not valid in local part unless local part is quoted&#39;;
         if (!preg_match(&#39;/^"(\\\\"|[^"])+"$/&#39;,str_replace("\\\\","",$local))){
            $isValid = false;
         }
      }
      if ($isValid && !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A"))){
                 $msg = &#39;  domain <b>&#39;.$domain.&#39;</b> not found in DNS&#39;;
         $isValid = false;
      }
    }
      $this->error = $msg;
    return $isValid;
  }
}
?>

调用示例：

<?php
include "sendmail.class.php";
$Mail = new sendmail();
// Set congif
$Mail->SendMailVia = &#39;smtp&#39;;  // Send via smtp server or mail function
$Mail->smtp_host = &#39;mail.myhost.com&#39;;
$Mail->smtp_port = 25;
$Mail->smtp_user = &#39;user@myhost.com&#39;;
$Mail->smtp_password = &#39;mypassw&#39;;
// 例1 (mail from me)
if($Mail->Send(&#39;mymail1@mydomain.com; recipient2 name <recipientmail2@mydomain.com>,"recipient name" <recipient@mail.com>&#39;,
&#39;My subject&#39;,&#39;My message here.&#39;))
{
  echo &#39;邮件已发送!&#39;;
}
else
{
  echo $Mail->error;
}
// 例2 (mail from me)
$Mail->mail_to = &#39;mymail1@mydomain.com; recipient2 name <recipientmail2@mydomain.com>,"recipient name" <recipient@mail.com>&#39;;
$Mail->subject = &#39;My subject&#39;;
$Mail->message = &#39;My message here&#39;;
if($Mail->Send())
{
  echo &#39;邮件已发送!&#39;;
}
else
{
  echo $Mail->error;
}
// 例3 (mail from another user: example user2@site2.com)
$Mail->mail_to = &#39;Recipient Name <recipientmail@domain.com>&#39;;
$Mail->subject = &#39;My subject&#39;;
$Mail->message = &#39;My message here&#39;;
$Mail->from_name = &#39;User2 Name&#39;;
$Mail->SendFromMail = &#39;user2@site2.com&#39;;
if($Mail->Send())
{
  echo &#39;message Mail send!&#39;;
}
else
{
  echo $Mail->error;
}
?>

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