分享一个简单实用的SMTP类

最近在忙活着之前发布的那个通讯录的修改，最近实现了邮件取回密码的功能，顺便更大家分享下网上找到的一个简单的SMTP类，也非常实用，拿出来跟大家分享，这个是来自国外一个专门分享class的网站，忘了网址了，来看code吧。

Mail is send!')) {
	echo 'Mail is sent -> OK';
}
else {
	echo 'Mail is not sent';
}
?>

File:mail_class.php

to = &$to;
        $this->subject = &$subject;
        $this->message = &$message;
        // Connect to server
        if(!$this->Connect2Server()) {
        	// Display error message
            echo $this->Error.$this->newline.''.$this->newline;
            return false;
        }
        return true;
    }
    private function Connect2Server() {
        // Connect to server
        $this->smtpConnect = fsockopen($this->smtpServer,$this->port,$errno,$error,$this->timeout);
        $this->logArray['CONNECT_RESPONSE'] = $this->readResponse();
        if (!is_resource($this->smtpConnect)) {
            return false;
        }
        $this->logArray['connection'] = "Connection accepted: $smtpResponse";
        // Hi, server!
        $this->sendCommand("EHLO $this->localdomain");
        $this->logArray['EHLO'] = $this->readResponse();
        // Let's know each other
        $this->sendCommand('AUTH LOGIN');
        $this->logArray['AUTH_REQUEST'] = $this->readResponse();
        // My name...
        $this->sendCommand(base64_encode($this->username));
        $this->logArray['REQUEST_USER'] = $this->readResponse();
        // My password..
        $this->sendCommand(base64_encode($this->password));
        $this->logArray['REQUEST_PASSWD'] = $this->readResponse();
        // If error in response auth...
        if (substr($this->logArray['REQUEST_PASSWD'],0,3)!='235') {
            $this->Error .= 'Authorization error! '.$this->logArray['REQUEST_PASSWD'].$this->newline;
            return false;
        }
        // "From" mail...
        $this->sendCommand("MAIL FROM: $this->username");
        $this->logArray['MAIL_FROM_RESPONSE'] = $this->readResponse();
        if (substr($this->logArray['MAIL_FROM_RESPONSE'],0,3)!='250') {
            $this->Error .= 'Mistake in sender\'s address! '.$this->logArray['MAIL_FROM_RESPONSE'].$this->newline;
            return false;
        }
        // "To" address
        $this->sendCommand("RCPT TO: $this->to");
        $this->logArray['RCPT_TO_RESPONCE'] = $this->readResponse();
        if (substr($this->logArray['RCPT_TO_RESPONCE'],0,3)!='250') {
            $this->Error .= 'Mistake in reciepent address! '.$this->logArray['RCPT_TO_RESPONCE'].$this->newline;
        }
        // Send data to server
        $this->sendCommand('DATA');
        $this->logArray['DATA_RESPONSE'] = $this->readResponse();
        // Send mail message
        if (!$this->sendMail()) return false;
        // Good bye server! =)
        $this->sendCommand('QUIT');
        $this->logArray['QUIT_RESPONSE'] = $this->readResponse();
        // Close smtp connect
        fclose($this->smtpConnect);
        return true;
    }
    // Function send mail
    private function sendMail() {
        $this->sendHeaders();
        $this->sendCommand($this->message);
        $this->sendCommand('.');
        $this->logArray['SEND_DATA_RESPONSE'] = $this->readResponse();
        if(substr($this->logArray['SEND_DATA_RESPONSE'],0,3)!='250') {
            $this->Error .= 'Mistake in sending data! '.$this->logArray['SEND_DATA_RESPONSE'].$this->newline;
            return false;
        }
        return true;
    }
    // Function read response
    private function readResponse() {
        $data="";
        while($str = fgets($this->smtpConnect,4096))
        {
            $data .= $str;
            if(substr($str,3,1) == " ") { break; }
        }
        return $data;
    }
    // function send command to server
    private function sendCommand($string) {
        fputs($this->smtpConnect,$string.$this->newline);
        return ;
    }
    // function send headers
    private function sendHeaders() {
        $this->sendCommand("Date: ".date("D, j M Y G:i:s")." +0700");
        $this->sendCommand("From: <$this->username>");
        $this->sendCommand("Reply-To: <$this->username>");
        $this->sendCommand("To: <$this->to>");
        $this->sendCommand("Subject: $this->subject");
        $this->sendCommand("MIME-Version: 1.0");
        $this->sendCommand("Content-Type: text/html; charset=$this->charset");
        if ($this->contentTransferEncoding) $this->sendCommand("Content-Transfer-Encoding: $this->contentTransferEncoding");
        $this->sendCommand($this->newline);
        return ;
    }
    public function __destruct() {
        if (is_resource($this->smtpConnect)) fclose($this->smtpConnect);
    }
}
?>