PHP发送电子邮件的类

<?  
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 = ereg_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)  
{  
$domain = ereg_replace("^.+@([^@]+)$", "\\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 (!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", $address);  

return $address;  
}  

function smtp_debug($message)  
{  
if ($this->debug) {  
echo $message;  
}  
}  
}  

?>