PHP如何实现支持SSL连接的SMTP邮件发送类

<?php/*** 邮件发送类* 支持发送纯文本邮件和HTML格式的邮件，可以多收件人，多抄送，多秘密抄送，带附件(单个或多个附件),支持到服务器的ssl连接* 需要的php扩展：sockets、Fileinfo和openssl。* 编码格式是UTF-8，传输编码格式是base64* @example* $mail = new MySendMail();* $mail->setServer("smtp@126.com", "XXXXX@126.com", "XXXXX"); //设置smtp服务器，普通连接方式* $mail->setServer("smtp.gmail.com", "XXXXX@gmail.com", "XXXXX", 465, true); //设置smtp服务器，到服务器的SSL连接* $mail->setFrom("XXXXX"); //设置发件人* $mail->setReceiver("XXXXX"); //设置收件人，多个收件人，调用多次* $mail->setCc("XXXX"); //设置抄送，多个抄送，调用多次* $mail->setBcc("XXXXX"); //设置秘密抄送，多个秘密抄送，调用多次* $mail->addAttachment("XXXX"); //添加附件，多个附件，调用多次* $mail->setMail("test", "<b>test</b>"); //设置邮件主题、内容* $mail->sendMail(); //发送*/class MySendMail {    /**    * @var string 邮件传输代理用户名    * @access protected    */    protected $_userName;    /**    * @var string 邮件传输代理密码    * @access protected    */    protected $_password;    /**    * @var string 邮件传输代理服务器地址    * @access protected    */    protected $_sendServer;    /**    * @var int 邮件传输代理服务器端口    * @access protected    */    protected $_port;    /**    * @var string 发件人    * @access protected    */    protected $_from;    /**    * @var array 收件人    * @access protected    */    protected $_to = array();    /**    * @var array 抄送    * @access protected    */    protected $_cc = array();    /**    * @var array 秘密抄送    * @access protected    */    protected $_bcc = array();    /**    * @var string 主题    * @access protected    */    protected $_subject;    /**    * @var string 邮件正文    * @access protected    */    protected $_body;    /**    * @var array 附件    * @access protected    */    protected $_attachment = array();    /**    * @var reource socket资源    * @access protected    */    protected $_socket;    /**    * @var reource 是否是安全连接    * @access protected    */    protected $_isSecurity;    /**    * @var string 错误信息    * @access protected    */    protected $_errorMessage;    /**    * 设置邮件传输代理，如果是可以匿名发送有邮件的服务器，只需传递代理服务器地址就行    * @access public    * @param string $server 代理服务器的ip或者域名    * @param string $username 认证账号    * @param string $password 认证密码    * @param int $port 代理服务器的端口，smtp默认25号端口    * @param boolean $isSecurity 到服务器的连接是否为安全连接，默认false    * @return boolean    */    public function setServer($server, $username="", $password="", $port=25, $isSecurity=false) {        $this->_sendServer = $server;        $this->_port = $port;        $this->_isSecurity = $isSecurity;        $this->_userName = empty($username) ? "" : base64_encode($username);        $this->_password = empty($password) ? "" : base64_encode($password);        return true;    }    /**    * 设置发件人    * @access public    * @param string $from 发件人地址    * @return boolean    */    public function setFrom($from) {        $this->_from = $from;        return true;    }    /**    * 设置收件人，多个收件人，调用多次.    * @access public    * @param string $to 收件人地址    * @return boolean    */    public function setReceiver($to) {        $this->_to[] = $to;        return true;    }    /**    * 设置抄送，多个抄送，调用多次.    * @access public    * @param string $cc 抄送地址    * @return boolean    */    public function setCc($cc) {        $this->_cc[] = $cc;        return true;    }    /**    * 设置秘密抄送，多个秘密抄送，调用多次    * @access public    * @param string $bcc 秘密抄送地址    * @return boolean    */    public function setBcc($bcc) {        $this->_bcc[] = $bcc;        return true;    }    /**    * 设置邮件附件，多个附件，调用多次    * @access public    * @param string $file 文件地址    * @return boolean    */    public function addAttachment($file) {        if(!file_exists($file)) {            $this->_errorMessage = "file " . $file . " does not exist.";            return false;        }        $this->_attachment[] = $file;        return true;    }    /**    * 设置邮件信息    * @access public    * @param string $body 邮件主题    * @param string $subject 邮件主体内容，可以是纯文本，也可是是HTML文本    * @return boolean    */    public function setMail($subject, $body) {        $this->_subject = base64_encode($subject);        $this->_body = base64_encode($body);        return true;    }    /**    * 发送邮件    * @access public    * @return boolean    */    public function sendMail() {        $command = $this->getCommand();        $this->_isSecurity ? $this->socketSecurity() : $this->socket();        foreach ($command as $value) {            $result = $this->_isSecurity ? $this->sendCommandSecurity($value[0], $value[1]) : $this->sendCommand($value[0], $value[1]);            if($result) {                continue;            }            else{                return false;            }        }        //其实这里也没必要关闭，smtp命令：QUIT发出之后，服务器就关闭了连接，本地的socket资源会自动释放        $this->_isSecurity ? $this->closeSecutity() : $this->close();        return true;    }    /**    * 返回错误信息    * @return string    */    public function error(){        if(!isset($this->_errorMessage)) {            $this->_errorMessage = "";        }        return $this->_errorMessage;    }    /**    * 返回mail命令    * @access protected    * @return array    */    protected function getCommand() {        $separator = "----=_Part_" . md5($this->_from . time()) . uniqid(); //分隔符        $command = array(                array("HELO sendmail\r\n", 250)            );        if(!empty($this->_userName)){            $command[] = array("AUTH LOGIN\r\n", 334);            $command[] = array($this->_userName . "\r\n", 334);            $command[] = array($this->_password . "\r\n", 235);        }        //设置发件人        $command[] = array("MAIL FROM: <" . $this->_from . ">\r\n", 250);        $header = "FROM: <" . $this->_from . ">\r\n";        //设置收件人        if(!empty($this->_to)) {            $count = count($this->_to);            if($count == 1){                $command[] = array("RCPT TO: <" . $this->_to[0] . ">\r\n", 250);                $header .= "TO: <" . $this->_to[0] .">\r\n";            }            else{                for($i=0; $i<$count; $i++){                    $command[] = array("RCPT TO: <" . $this->_to[$i] . ">\r\n", 250);                    if($i == 0){                        $header .= "TO: <" . $this->_to[$i] .">";                    }                    elseif($i + 1 == $count){                        $header .= ",<" . $this->_to[$i] .">\r\n";                    }                    else{                        $header .= ",<" . $this->_to[$i] .">";                    }                }            }        }        //设置抄送        if(!empty($this->_cc)) {            $count = count($this->_cc);            if($count == 1){                $command[] = array("RCPT TO: <" . $this->_cc[0] . ">\r\n", 250);                $header .= "CC: <" . $this->_cc[0] .">\r\n";            }            else{                for($i=0; $i<$count; $i++){                    $command[] = array("RCPT TO: <" . $this->_cc[$i] . ">\r\n", 250);                    if($i == 0){                    $header .= "CC: <" . $this->_cc[$i] .">";                    }                    elseif($i + 1 == $count){                        $header .= ",<" . $this->_cc[$i] .">\r\n";                    }                    else{                        $header .= ",<" . $this->_cc[$i] .">";                    }                }            }        }        //设置秘密抄送        if(!empty($this->_bcc)) {            $count = count($this->_bcc);            if($count == 1) {                $command[] = array("RCPT TO: <" . $this->_bcc[0] . ">\r\n", 250);                $header .= "BCC: <" . $this->_bcc[0] .">\r\n";            }            else{                for($i=0; $i<$count; $i++){                    $command[] = array("RCPT TO: <" . $this->_bcc[$i] . ">\r\n", 250);                    if($i == 0){                    $header .= "BCC: <" . $this->_bcc[$i] .">";                    }                    elseif($i + 1 == $count){                        $header .= ",<" . $this->_bcc[$i] .">\r\n";                    }                    else{                        $header .= ",<" . $this->_bcc[$i] .">";                    }                }            }        }        //主题        $header .= "Subject: =?UTF-8?B?" . $this->_subject ."?=\r\n";        if(isset($this->_attachment)) {            //含有附件的邮件头需要声明成这个            $header .= "Content-Type: multipart/mixed;\r\n";        }        elseif(false){            //邮件体含有图片资源的,且包含的图片在邮件内部时声明成这个，如果是引用的远程图片，就不需要了            $header .= "Content-Type: multipart/related;\r\n";        }        else{            //html或者纯文本的邮件声明成这个            $header .= "Content-Type: multipart/alternative;\r\n";        }        //邮件头分隔符        $header .= "\t" . 'boundary="' . $separator . '"';        $header .= "\r\nMIME-Version: 1.0\r\n";        //这里开始是邮件的body部分，body部分分成几段发送        $header .= "\r\n--" . $separator . "\r\n";        $header .= "Content-Type:text/html; charset=utf-8\r\n";        $header .= "Content-Transfer-Encoding: base64\r\n\r\n";        $header .= $this->_body . "\r\n";        $header .= "--" . $separator . "\r\n";        //加入附件        if(!empty($this->_attachment)){            $count = count($this->_attachment);            for($i=0; $i<$count; $i++){                $header .= "\r\n--" . $separator . "\r\n";                $header .= "Content-Type: " . $this->getMIMEType($this->_attachment[$i]) . '; name="=?UTF-8?B?' . base64_encode( basename($this->_attachment[$i]) ) . '?="' . "\r\n";                $header .= "Content-Transfer-Encoding: base64\r\n";                $header .= 'Content-Disposition: attachment; filename="=?UTF-8?B?' . base64_encode( basename($this->_attachment[$i]) ) . '?="' . "\r\n";                $header .= "\r\n";                $header .= $this->readFile($this->_attachment[$i]);                $header .= "\r\n--" . $separator . "\r\n";            }        }        //结束邮件数据发送        $header .= "\r\n.\r\n";         $command[] = array("DATA\r\n", 354);        $command[] = array($header, 250);        $command[] = array("QUIT\r\n", 221);        return $command;    }    /**    * 发送命令    * @access protected    * @param string $command 发送到服务器的smtp命令    * @param int $code 期望服务器返回的响应吗    * @return boolean    */    protected function sendCommand($command, $code) {        echo 'Send command:' . $command . ',expected code:' . $code . '<br />';        //发送命令给服务器        try{            if(socket_write($this->_socket, $command, strlen($command))){                //当邮件内容分多次发送时，没有$code，服务器没有返回                if(empty($code))  {                    return true;                }                //读取服务器返回                $data = trim(socket_read($this->_socket, 1024));                echo 'response:' . $data . '<br /><br />';                if($data) {                    $pattern = "/^".$code."+?/";                    if(preg_match($pattern, $data)) {                        return true;                    }                    else{                        $this->_errorMessage = "Error:" . $data . "|**| command:";                        return false;                    }                }                else{                    $this->_errorMessage = "Error:" . socket_strerror(socket_last_error());                    return false;                }            }            else{                $this->_errorMessage = "Error:" . socket_strerror(socket_last_error());                return false;            }        }catch(Exception $e) {            $this->_errorMessage = "Error:" . $e->getMessage();        }    }    /**    * 安全连接发送命令    * @access protected    * @param string $command 发送到服务器的smtp命令    * @param int $code 期望服务器返回的响应吗    * @return boolean    */    protected function sendCommandSecurity($command, $code) {        echo 'Send command:' . $command . ',expected code:' . $code . '<br />';        try {            if(fwrite($this->_socket, $command)){                //当邮件内容分多次发送时，没有$code，服务器没有返回                if(empty($code))  {                    return true;                }                //读取服务器返回                $data = trim(fread($this->_socket, 1024));                echo 'response:' . $data . '<br /><br />';                if($data) {                    $pattern = "/^".$code."+?/";                    if(preg_match($pattern, $data)) {                        return true;                    }                    else{                        $this->_errorMessage = "Error:" . $data . "|**| command:";                        return false;                    }                }                else{                    return false;                }            }            else{                $this->_errorMessage = "Error: " . $command . " send failed";                return false;            }        }catch(Exception $e) {            $this->_errorMessage = "Error:" . $e->getMessage();        }    }    /**    * 读取附件文件内容，返回base64编码后的文件内容    * @access protected    * @param string $file 文件    * @return mixed    */    protected function readFile($file) {        if(file_exists($file)) {            $file_obj = file_get_contents($file);            return base64_encode($file_obj);        }        else {            $this->_errorMessage = "file " . $file . " dose not exist";            return false;        }    }    /**    * 获取附件MIME类型    * @access protected    * @param string $file 文件    * @return mixed    */    protected function getMIMEType($file) {        if(file_exists($file)) {            $mime = mime_content_type($file);            /*if(! preg_match("/gif|jpg|png|jpeg/", $mime)){                $mime = "application/octet-stream";            }*/            return $mime;        }        else {            return false;        }    }    /**    * 建立到服务器的网络连接    * @access protected    * @return boolean    */    protected function socket() {        //创建socket资源        $this->_socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));        if(!$this->_socket) {            $this->_errorMessage = socket_strerror(socket_last_error());            return false;        }        socket_set_block($this->_socket);//设置阻塞模式        //连接服务器        if(!socket_connect($this->_socket, $this->_sendServer, $this->_port)) {            $this->_errorMessage = socket_strerror(socket_last_error());            return false;        }        $str = socket_read($this->_socket, 1024);        if(!preg_match("/220+?/", $str)){            $this->_errorMessage = $str;            return false;        }        return true;    }    /**    * 建立到服务器的SSL网络连接    * @access protected    * @return boolean    */    protected function socketSecurity() {        $remoteAddr = "tcp://" . $this->_sendServer . ":" . $this->_port;        $this->_socket = stream_socket_client($remoteAddr, $errno, $errstr, 30);        if(!$this->_socket){            $this->_errorMessage = $errstr;            return false;        }        //设置加密连接，默认是ssl，如果需要tls连接，可以查看php手册stream_socket_enable_crypto函数的解释        stream_socket_enable_crypto($this->_socket, true, STREAM_CRYPTO_METHOD_SSLv23_CLIENT);        stream_set_blocking($this->_socket, 1); //设置阻塞模式        $str = fread($this->_socket, 1024);        if(!preg_match("/220+?/", $str)){            $this->_errorMessage = $str;            return false;        }        return true;    }    /**    * 关闭socket    * @access protected    * @return boolean    */    protected function close() {        if(isset($this->_socket) && is_object($this->_socket)) {            $this->_socket->close();            return true;        }        $this->_errorMessage = "No resource can to be close";        return false;    }    /**    * 关闭安全socket    * @access protected    * @return boolean    */    protected function closeSecutity() {        if(isset($this->_socket) && is_object($this->_socket)) {            stream_socket_shutdown($this->_socket, STREAM_SHUT_WR);            return true;        }        $this->_errorMessage = "No resource can to be close";        return false;    }}