PHPでメールを送信するための2つのクラスについて（ずっと探していました。）

<?phprequire_once(&#39;email.class.php&#39;);//##########################################$smtpserver = "smtp.163.com";//SMTP服务器$smtpserverport = 25;//SMTP服务器端口$smtpusermail = "[email&#160;protected]";//SMTP服务器的用户邮箱$smtpemailto = "[email&#160;protected]";//发送给谁$smtpuser = "[email&#160;protected]";//SMTP服务器的用户帐号$smtppass = "********";//SMTP服务器的用户密码$mailsubject = "PHP测试邮件系统";//邮件主题$mailbody = "<h1> 这是一个测试程序</h1>";//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 = true;//是否显示发送的调试信息$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype);?>

<?phpclass smtp{    /* Public Variables */    public $smtp_port;    public $time_out;    public $host_name;    public $log_file;    public $relay_host;    public $debug;    public $auth;    public $user;    public $pass;    /* Private Variables */    private $sock;    /* Constractor */    function smtp($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 = 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<" . $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");        }        echo "<br>";        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:<" . $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)    {        $domain = preg_replace("/^.+@([^@]+)$/", "\\1", $address);        if ([email protected]($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() . "]: " . $message;        if ([email protected]_exists($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 $message . "<br>";        }    }    function get_attach_type($image_tag)    { //        $filedata = array();        $img_file_con = fopen($image_tag, "r");        unset($image_data);        while ($tem_buffer = AddSlashes(fread($img_file_con, filesize($image_tag))))            $image_data = $tem_buffer;        fclose($img_file_con);        $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 ?>