PHP邮件发送类【精简版】

一般发系统通知之类的邮件，这个版本就足够.
/**
* 邮件发送类
* 仅支持发送纯文本和HTML内容邮件
* 需要的php扩展，sockets
* @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
* $mail->setMailInfo("test", "test"); 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 private
*/
private $_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 主题
* @access protected
*/
protected $_subject;

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

/**
* @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，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 $port 代理服务器的端口，smtp默认25号端口
* @return boolean
*/
public function setServer($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
* @access public
* @param string $to 收件人地址
* @return boolean
*/
public function setReceiver($to) {
$this->_to = $to;
return true;
}

/**
* 设置邮件信息
* @access public
* @param string $body 邮件主题
* @param string $subject 邮件主体内容，可以是纯文本，也可是是HTML文本
* @return boolean
*/
public function setMailInfo($subject, $body) {
$this->_subject = $subject;
$this->_body = base64_encode($body);
if(!empty($attachment)) {
$this->_attachment = $attachment;
}
return true;
}

/**
* 发送邮件
* @access public
* @return boolean
*/
public function sendMail() {
$command = $this->getCommand();
$this->socket();

foreach ($command as $value) {
if($this->sendCommand($value[0], $value[1])) {
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->close();
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() {
$separator = "----=_Part_" . md5($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: _from . ">\r\n", 250);
$header = "FROM: _from . ">\r\n";

//设置收件人
$command[] = array("RCPT TO: _to . ">\r\n", 250);
$header .= "TO: _to . ">\r\n";

$header .= "Subject: " . $this->_subject ."\r\n";
$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";
$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";

//结束数据
$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:' . $code . '
';
//发送命令给服务器
try{
if(socket_write($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 . '

';

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();
}
}

/**
* 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("XXXX", "XXX@XXX", "XXX");
$mail->setFrom("XXX@XX");
$mail->setReceiver("XXX@XX");
$mail->setMailInfo("test", "test");
$mail->sendMail();

AD：真正免费，域名+虚机+企业邮箱=0元