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

/ 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));
$body = preg_replace("/(^|(rn))(.)/","1.3",$body);
$header = "MIME-Version:1.0rn";
if($mailtype=="HTML")
{
$header .= "Content-Type:text/htmlrn";
}
$header .= "To: ".$to."rn";
if ($cc != "")
{
$header .= "Cc: ".$cc."rn";
}
$header .= "From: $from<".$from.">rn";
$header .= "Subject: ".$subject."rn";
$header .= $additional_headers;
$header .= "Date: ".date("r")."rn";
$header .= "X-Mailer:By Redhat (PHP/".phpversion().")rn";
list($msec,$sec) = explode(" ",microtime());
$header .= "Message-ID: <".date("YmdHis",$sec).".".($msec*1000000).".".$mail_from.">rn";
$TO = explode(",",$this->strip_comment($to));

if ($cc != "")
{
$TO = array_merge($TO,explode(",$this->strip_comment($cc)));
}
if ($bcc != "")
{
$TO = array_merge($TO,$this->strip_comment($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 hostn");
}
return $sent;
}

/ Private Functions /
function smtp_send($helo,$to,$body = "")
{
if (!$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 $this->smtp_error("sending . [EOM]");
}
if (!$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;;
}

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