PHP用邮件取回忘记密码功能？

<form id="form1" name="form1" method="post" action="mailto.php" onSubmit="return CheckForm()">  
<input name="username" type="text" class="in" id="username" size="30" onmouseover="fEvent('mouseover',this)" onfocus="fEvent('focus',this)" onblur="fEvent('blur',this)" onmouseout="fEvent('mouseout',this)"  />  
  
<input type="submit" name="Submit" style="background:url(images/bo2.jpg); height:36px; width:113px; border:none; font-size:14px; font-weight:bold; color:#FFFFFF" value=" 确定找回 " />  
  
</form>  

mailto.php

<?php  
require_once ('conn.php');  
require_once ("mailclass.php");  
  
$username = trim($_POST['username']);  
  
$sql="select username,email,password from member where username='$username'";  
  
$query=mysql_query($sql,$conn);  
$num=mysql_num_rows($query);  
$userinfo=mysql_fetch_array($query);  
  
if($num<=0){  
echo "<mce:script type="text/javascript"><!--  
alert('用户名不存在！');history.back(-1);  
// --></mce:script>";  
exit;  
}else{  
  
$user_name = $userinfo['username'];  
$password = $userinfo['password'];  
$user_email = $userinfo['email'];  
  
$x = md5($username.'+'.$password);  
  
$string = base64_encode($username.".".$x);  
  
  
$smtpserver = "smtp.126.com";//SMTP服务器  
  
  
$smtpserverport =25;//SMTP服务器端口  
  
  
$smtpusermail = "[email protected]";//SMTP服务器的用户邮箱  
  
  
$smtpemailto =$user_email;//发送给谁  
  
  
$smtpuser = "[email protected]";//SMTP服务器的用户帐号  
  
  
$smtppass = "daniel938292525";//SMTP服务器的用户密码  
  
  
$mailsubject = "[亿廷--新能源 新智能] 取回密码邮件 ";//邮件主题  
  
  
$mailbody = "尊敬的".$username."先生/女士：<br />    取回密码邮件<br />请点击下面的链接，按流程进行密码重设。<a href="http://localhost/in-te/resetUserPass.php?p=".$string."" mce_href="http://localhost/in-te/resetUserPass.php?p=".$string."">http://localhost/in-te/resetUserPass.php?p=".$string."</a><br>(如果上面不是链接形式，请将地址手工粘贴到浏览器地址栏再访问)  
上面的页面打开后，输入新的密码后提交，之后您即可使用新的密码登录了。<br><br>此邮件为系统邮件，请勿直接回复";  
//邮件内容  
  
  
$mailtype = "HTML";//邮件格式（HTML/TXT）,TXT为文本邮件  
  
  
$smtp = new smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppass);//这里面的一个true是表示使用身份验证,否则不使用身份验证.  
  
  
$smtp->debug = false;//是否显示发送的调试信息  
  
  
$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype);  
  
?>  
   
              <table width="80%" border="0" align="center" cellpadding="0" cellspacing="0">  
                <tr>  
                  <td height="35" align="center"><?  
 echo "<div style="font-size:16px;font-weight:bold;" mce_style="font-size:16px;font-weight:bold;">密码已经发送到:<span style="color=#ff0000" mce_style="color=#ff0000">".$user_email."</span>邮箱,请去查收!</div>";  
   
}  
?>  

mailclass.php

<?php  
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;  
  
  
        }  
  
  
    }  
  
  
}  
  
  
?>  

resetUserPass.php

<?php  
/** 
 * 用base64_decode解开$_GET['p']的值 
*/  
$p=$_GET['p'];  
$array = explode('.',base64_decode($p));  
//echo "<br>";  
/** 
 * 这时，我们会得到一个数组，$array，里面分别存放了用户名和我们需要一段字符串 
 * $array[0] 为用户名 
 * $array[1] 为我们生成的字符串 
*/  
//好了，我们开始进行匹配工作吧。  
  
$sql = "select password from member where username = '".trim($array['0'])."'";  
//echo $sql;  
$query=mysql_query($sql,$conn);  
$rs=mysql_fetch_array($query);  
  
$password = $rs['password'];  
/** 
 * 产生配置码  
*/  
 $checkCode = md5($array['0'].'+'.$password);  
/** 
 * 进行配置验证： =>  
*/  
?>  
<?  
if( $array['1'] === $checkCode ){  
  
       //执行重置程序，一般给出三个输入框。   
       echo "<form name='form1' id='form1' method='post' action='' onSubmit='return CheckForm()'>";  
       echo "<table width='80%' border='0' cellspacing='0' cellpadding='0'>";  
              echo "<tr>";  
                echo "<td width='28%' align='right'> </td>";  
                echo "<td width='10%' height='30' align='right'>用 户 名：</td>";  
                echo "<td width='62%' align='left'>".$array['0']."<input name='username' type='hidden' id='username' value='".$array['0']."'/></td>";  
              echo "</tr>";  
              echo "<tr>";  
                echo "<td align='right'> </td>";  
                echo "<td height='30' align='right'>新 密 码：</td>";  
                echo "<td align='left'><input name='newpassword' type='password' id='newpassword' class='in'/></td>";  
             echo " </tr>";  
              echo "<tr>";  
                echo "<td align='right'> </td>";  
                echo "<td height='30' align='right'>确认密码：</td>";  
                echo "<td align='left'><input name='conpassword' type='password' id='conpassword' class='in'/></td>";  
              echo "</tr>";  
              echo "<tr>";  
                echo "<td align='right'> </td>";  
                echo "<td height='50' colspan='2' align='left'><div style="margin-left:30px" mce_style="margin-left:30px"><input type='submit' name='update' style='background:url(images/bo2.jpg); height:36px; width:113px; border:none; font-size:14px; font-weight:bold; color:#FFFFFF' value=' 修改密码 ' /></div></td>";  
             echo " </tr>";  
            echo "</table> ";  
       echo "</form>";  
}else{  
       //给出定义错误页面  
       //header('location:error.php');  
       print"<mce:script type="text/javascript"><!--  
location.href='error.php';  
// --></mce:script>";//*/  
}  
  
if($_POST['username']){  
        $username = trim($_POST['username']);  
       $newpassword=trim($_POST['newpassword']);  
       $newpassword=md5("$newpassword".ALL_PS);  
      
    $sql="update member set password='$newpassword' where username='$username'";  
    //echo $sql;  
    //exit;  
    mysql_query($sql,$conn);  
    print"<mce:script type="text/javascript"><!--  
alert('密码修改成功!');location.href='login.php';  
// --></mce:script>";//*/  
    }  
?>