PHP实现发送邮件的方法(基于简单邮件发送类)

本文实例讲述了PHP实现发送邮件的方法。分享给大家供大家参考，具体如下：

邮件发送类

<?php /*邮件发送类 *功能：使用smtp服务器发送邮件 */ class smtp {  /* 全局变量 */  var $smtp_port;  var $time_out;  var $host_name;  var $log_file;  var $relay_host;  var $debug;  var $auth;  var $user;  var $pass;  var $sock;  /* 构造函数 */  function smtp($relay_host = "", $smtp_port = 25, $auth = false, $log_file="", $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 = $log_file; //邮件发送成功失败的日志记录文件    $this->sock = FALSE;  }  function mail_encode($str)  {   //return '=?utf-8?B?'.base64_encode(mb_convert_encoding($str, "GBK", "UTF-8")).'?=';   return "=?UTF-8?B?".base64_encode($str)."?="; }  /* 主函数，发送邮件 */  function sendmail($flag, $boundary, $to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "") {   $mail_from = $this->get_address ( $this->strip_comment ( $from ) );   $body = ereg_replace ( '(^|(/r/n))(/.)', "/1./3", $body );   $header = "MIME-Version:1.0/r/n";   if ($mailtype == "HTML") {    if ($flag == 2) {     $header .= "Content-Type:multipart/mixed; boundary= $boundary/r/n";    } else {     $header .= "Content-Type:text/html; charset=/"UTF-8/" /r/n";    }   }   $header .= "To: " . $to . "/r/n";     if ($cc != "") {    $header .= "Cc: " . $cc . "/r/n";   }    $header .= "From: $from<" . $from . ">/r/n";   $subject = self::mail_encode($subject);   $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 $sent;  }  /* 私有函数 */  function smtp_send($helo, $from, $to, $header, $body = "") {   if (! $this->smtp_putcmd ( "HELO", $helo )) {    return $this->smtp_error ( "sending HELO command" );   }   if ($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 = ereg_replace ( "^.+@([^@]+){1}quot;, "/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 (! ereg ( "^[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 ( ereg ( $comment, $address ) ) {   $address = ereg_replace ( $comment, "", $address );  }  return $address; } function get_address($address) {  $address = ereg_replace ( "([ /t/r/n])+", "", $address );  $address = ereg_replace ( "^.*<(.+)>.*{1}quot;, "/1", $address );  return $address; } function smtp_debug($message) {  if ($this->debug) {   echo $message;  } }}?>