php smtp实现发送邮件功能

本文实例为大家分享了php smtp发送邮件功能的具体代码，供大家参考，具体内容如下

<?phpheader("Content-Type: text/html; charset=utf-8"); class smtp{ /* Public Variables */ var $smtp_port; var $time_out; var $host_name; var $log_file; var $relay_host; var $debug; var $auth; var $user; var $pass;  /* Private Variables */  var $sock;  /* Constractor */ function smtp($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");  }  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", $address);  if (!@getmxrr($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 (!@file_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;  } } }?>