【升级】php socket通过smtp发送邮件（纯文本、HTML，多收件人，多抄送，多密送）

<?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
* @example
* $mail = new MySendMail();
* $mail->setServer("XXXXX", "XXXXX@XXXXX", "XXXXX"); 设置smtp服务器
* $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->setMailInfo("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 private
	*/
	private $_userName;

	/**
	* @var string 邮件传输代理密码
	* @access private
	*/
	private $_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=25;

	/**
	* @var string 发件人
	* @access protected
	*/
	protected $_from;

	/**
	* @var string 收件人
	* @access protected
	*/
	protected $_to;

	/**
	* @var string 抄送
	* @access protected
	*/
	protected $_cc;

	/**
	* @var string 秘密抄送
	* @access protected
	*/
	protected $_bcc;

	/**
	* @var string 主题
	* @access protected
	*/
	protected $_subject;

	/**
	* @var string 邮件正文
	* @access protected
	*/
	protected $_body;

	/**
	* @var string 附件
	* @access protected
	*/
	protected $_attachment;

	/**
	* @var boolean 是否是纯文本邮件
	* @access protected
	*/
	protected $_isPlain=false;

	/**
	* @var reource socket资源
	* @access protected
	*/
	protected $_socket;

	/**
	* @var string 错误信息
	* @access protected
	*/
	protected $_errorMessage;


	/**
	* 设置邮件传输代理
	* @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 $port 代理服务器的端口，smtp默认25号端口
	* @return boolean
	*/
	public function setServer($server, $username="", $password="", $port=25) {
		$this->_sendServer = $server;
		$this->_port = $port;
		if(!empty($username)) {
			$this->_userName = base64_encode($username);
		}
		if(!empty($password)) {
			$this->_password = base64_encode($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，连续调用多次.
	* @access public
	* @param string $to 收件人地址
	* @return boolean
	*/
	public function setReceiver($to) {
		if(isset($this->_to)) {
			if(is_string($this->_to)) {
				$this->_to = array($this->_to);
				$this->_to[] = $to;
				return true;
			}
			elseif(is_array($this->_to)) {
				$this->_to[] = $to;
				return true;
			}
			else {
				return false;
			}
		}
		else {
			$this->_to = $to;
			return true;
		}
	}

	/**
	* 设置抄送，多个抄送，连续调用多次.
	* @access public
	* @param string $cc 抄送地址
	* @return boolean
	*/
	public function setCc($cc) {
		if(isset($this->_cc)) {
			if(is_string($this->_cc)) {
				$this->_cc = array($this->_cc);
				$this->_cc[] = $cc;
				return true;
			}
			elseif(is_array($this->_cc)) {
				$this->_cc[] = $cc;
				return true;
			}
			else {
				return false;
			}
		}
		else {
			$this->_cc = $cc;
			return true;
		}
	}

	/**
	* 设置秘密抄送，多个秘密抄送，连续调用多次
	* @access public
	* @param string $bcc 秘密抄送地址
	* @return boolean
	*/
	public function setBcc($bcc) {
		if(isset($this->_bcc)) {
			if(is_string($this->_bcc)) {
				$this->_bcc = array($this->_bcc);
				$this->_bcc[] = $bcc;
				return true;
			}
			elseif(is_array($this->_bcc)) {
				$this->_bcc[] = $bcc;
				return true;
			}
			else {
				return false;
			}
		}
		else {
			$this->_bcc = $bcc;
			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
	* @param boolean $isPlain 是否是纯文本邮件，默认否
	* @param string $attachment 附件，文件地址
	* @return boolean
	*/
	public function setMailInfo($subject, $body, $isPlain=false, $attachment="") {
		$this->_subject = $subject;
		$this->_body = $body;
		$this->_isPlain = $isPlain;
		if(!empty($attachment)) {
			$this->_attachment = $attachment;
		}
		return true;
	}

	/**
	* 发送邮件
	* @access public
	* @return boolean
	*/
	public function sendMail() {
		$command = $this->getCommand();
		$this->socket();
		
		//print_r($command);exit;
		foreach ($command as $value) {
			if($this->sendCommand($value[0], $value[1])) {
				continue;
			}
			else{
				return false;
			}
		}
		
		$this->close(); //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
		echo 'Mail OK!';
		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() {
		$command = array(
				array("HELO sendmail\r\n", 250),
				array("AUTH LOGIN\r\n", 334),
				array($this->_userName . "\r\n", 334),
				array($this->_password . "\r\n", 235),
				array("MAIL FROM:<" . $this->_from . ">\r\n", 250)
				);

		//邮件头
		$header = "MIME-Version:1.0\r\n";
		if($this->_isPlain) {
			$header .= "Content-type:text/plain;charset=utf-8\r\n";
		}
		else{
			$header .= "Content-type:text/html;charset=utf-8\r\n";
		}

		//设置发件人
		$header .= "FROM:test<" . $this->_from . ">\r\n";

		//设置收件人
		if(is_array($this->_to)) {
			$count = count($this->_to);
			for($i=0; $i<$count; $i++){
				$command[] = array("RCPT TO:<" . $this->_to[$i] . ">\r\n", 250);
				$header .= "TO:<" . $this->_to[$i] . ">\r\n";
			}
		}
		else{
			$command[] = array("RCPT TO:<" . $this->_to . ">\r\n", 250);
			$header .= "TO:<" . $this->_to . ">\r\n";
		}

		//设置抄送
		if(isset($this->_cc)) {
			if(is_array($this->_cc)) {
				$count = count($this->_cc);
				for($i=0; $i<$count; $i++){
					$command[] = array("RCPT TO:<" . $this->_cc[$i] . ">\r\n", 250);
					$header .= "CC:<" . $this->_cc[$i] . ">\r\n";
				}
			}
			else{
				$command[] = array("RCPT TO:<" . $this->_cc . ">\r\n", 250);
				$header .= "CC:<" . $this->_cc . ">\r\n";
			}
		}

		//设置秘密抄送
		if(isset($this->_bcc)) {
			if(is_array($this->_bcc)) {
				$count = count($this->_bcc);
				for($i=0; $i<$count; $i++){
					$command[] = array("RCPT TO:<" . $this->_bcc[$i] . ">\r\n", 250);
					$header .= "BCC:<" . $this->_bcc[$i] . ">\r\n";
				}
			}
			else{
				$command[] = array("RCPT TO:<" . $this->_bcc . ">\r\n", 250);
				$header .= "BCC:<" . $this->_bcc . ">\r\n";
			}
		}

		$header .= "Subject:" . $this->_subject ."\r\n\r\n";
		$body= $this->_body . "\r\n.\r\n";
		$command[] = array("DATA\r\n", 354);
		$command[] = array($header, "");
		$command[] = array($body, 250);
		$command[] = array("QUIT\r\n", 221);

		return $command;
	}

	/**
	* @access protected
	* @param string $command 发送到服务器的smtp命令
	* @param int $code 期望服务器返回的响应吗
	* @param boolean
	*/
	protected function sendCommand($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();
		}
	}

	/**
	* 读取附件文件内容，返回base64编码后的文件内容
	* @access protected
	* @return mixed
	*/
	protected function readFile() {
		if(isset($this->_attachment) && file_exists($this->_attachment)) {
			$file = file_get_contents($this->_attachment);
			return base64_encode($file);
		}
		else {
			return false;
		}
	}

	/**
	* 建立到服务器的网络连接
	* @access private
	* @return boolean
	*/
	private function socket() {
		if(!function_exists("socket_create")) {
			$this->_errorMessage = "Extension sockets must be enabled";
			return false;
		}
		//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)) {
			$this->_errorMessage = socket_strerror(socket_last_error());
			return false;
		}
		socket_read($this->_socket, 1024);
		
		return true;
	}

	/**
	* 关闭socket
	* @access private
	* @return boolean
	*/
	private 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;
	}
}


/**************************** Test ***********************************/
$mail = new MySendMail();
$mail->setServer("XXXXX", "XXXXX@XXXXX", "XXXXX");
$mail->setFrom("XXXXX");
$mail->setReceiver("XXXXX");
$mail->setReceiver("XXXXX");
//$mail->setCc("XXXXXX");
//$mail->setCc("XXXXXX");
$mail->setBcc("XXXXX");
$mail->setBcc("XXXXX");
$mail->setMailInfo("test", "<b>test</b>");
$mail->sendMail();