How to implement forgotten password retrieval function in php

How to implement the forgotten password retrieval function in php: 1. Users need to provide an E-MAIL when registering; 2. Open the form and enter the E-MAIL used for registration; 3. Find it from the database The user information, and update the user's password to a temporary password; 4. Use the Jmail function to change the password.

The operating environment of this tutorial: windows10 system, php5.6. This article is applicable to all brands of computers.

Recommended: "PHP Video Tutorial"

Simple implementation of PHP member password retrieval function

Setting ideas

1. Users need to provide an E-MAIL when registering. The purpose is to use this email to retrieve the password.

2. When the user forgets their password or user name, click the "Retrieve Password" hyperlink on the login page, open the form, enter the email address used for registration, and submit.

3. The system finds the user information from the database through the mailbox, and updates the user's password to a temporary password (for example: 12345678).

4. The system uses the Jmail function to send the user's information to the user's mailbox (the content includes: user name, temporary password, and prompts to remind the user to change the temporary password in time).

5. Users can log in with a temporary password.

HTML

We place a page on the password retrieval page that requires the user to enter the email address used for registration, and then submit the front-end js to handle the interaction.

The code is as follows

<p><strong>輸入您註冊的電子郵箱，找回密碼：</strong></p> 
<p><input type="text" class="input" name="email" id="email"><span id="chkmsg"></span></p> 
<p><input type="button" class="btn" id="sub_btn" value="http://www.bitscn.com/pdb/php/201609/提 交"></p>

jQuery

After the user enters the email address and clicks submit, jQuery first verifies whether the email format is correct, and if correct, sends it to the background sendmail.php Ajax request, sendmail.php is responsible for verifying whether the mailbox exists and sending emails, and will return the corresponding processing results to the front page. Please see the jQuery code:

The code is as follows

$(function(){ 
$("#sub_btn").click(function(){ 
var email = $("#email").val(); 
var preg = /^w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*/; //匹配Email 
if(email=='' || !preg.test(email)){ 
$("#chkmsg").html("請填寫正確的郵箱！"); 
}else{ 
$("#sub_btn").attr("disabled","disabled").val('提交中..').css("cursor","default"); 
$.post("sendmail.php",{mail:email},function(msg){ 
if(msg=="noreg"){ 
$("#chkmsg").html("該郵箱尚未註冊！"); 
$("#sub_btn").removeAttr("disabled").val('提 交').css("cursor","pointer"); 
}else{ 
$(".demo").html("<h3 id="msg">"+msg+"</h3>"); 
} 
}); 
} 
}); 
})

The jQuery used above The code is very convenient and concisely completes the front-end interactive operation. If you have a certain jQuery foundation, the above code is clear at a glance and requires no explanation.

Of course, don’t forget to load the jQuery library file on the page. Some students often ask me why they can’t use the demo downloaded from the Internet. 80% of the time it’s because the loading path of jquery or other files is wrong, so it’s not necessary to load it. document.

PHP

#sendmail.php needs to verify whether the email exists in the system user table. If so, read the user information, use md5 encryption to generate a special character for the user id, user name and password. The string is used as the verification code to retrieve the password, and then the URL is constructed. At the same time, in order to control the timeliness of the URL link, we will record the operation time when the user submits the password retrieval action, and finally call the email sending class to send the email to the user's mailbox. The sending email class smtp.class.php has been packaged, please download it.

The code is as follows

include_once("connect.php");//連接數據庫 

$email = stripslashes(trim($_POST['mail'])); 

$sql = "select id,username,password from `t_user` where `email`='$email'"; 
$query = mysql_query($sql); 
$num = mysql_num_rows($query); 
if($num==0){//該郵箱尚未註冊！ 
echo 'noreg'; 
exit; 
}else{ 
$row = mysql_fetch_array($query); 
$getpasstime = time(); 
$uid = $row['id']; 
$token = md5($uid.$row['username'].$row['password']);//組合驗證碼 
$url = "/demo/resetpass/reset.php?email=".$email." 
&token=".$token;//構造URL 
$time = date('Y-m-d H:i'); 
$result = sendmail($time,$email,$url); 
if($result==1){//郵件發送成功 
$msg = &#39;系統已向您的郵箱發送了一封郵件<br/>請登錄到您的郵箱及時重置您的密碼！&#39;; 
//更新數據發送時間 
mysql_query("update `t_user` set `getpasstime`=&#39;$getpasstime&#39; where id=&#39;$uid &#39;"); 
}else{ 
$msg = $result; 
} 
echo $msg; 
} 

//發送郵件 
function sendmail($time,$email,$url){ 
include_once("smtp.class.php"); 
$smtpserver = ""; //SMTP服務器，如smtp.163.com 
$smtpserverport = 25; //SMTP服務器端口 
$smtpusermail = ""; //SMTP服務器的用戶郵箱 
$smtpuser = ""; //SMTP服務器的用戶帳號 
$smtppass = ""; //SMTP服務器的用戶密碼 
$smtp = new Smtp($smtpserver, $smtpserverport, true, $smtpuser, $smtppass); 
//這裏面的一個true是表示使用身份驗證,否則不使用身份驗證. 
$emailtype = "HTML"; //信件類型，文本:text；網頁：HTML 
$smtpemailto = $email; 
$smtpemailfrom = $smtpusermail; 
$emailsubject = "www.bitsCN.com - 找回密碼"; 
$emailbody = "親愛的".$email."：<br/>您在".$time."提交了找回密碼請求。請點擊下面的鏈接重置密碼 
（按鈕24小時內有效）。<br/><a href=&#39;".$url."&#39;target=&#39;_blank&#39;>".$url."</a>"; 
$rs = $smtp->sendmail($smtpemailto, $smtpemailfrom, $emailsubject, $emailbody, $emailtype); 

return $rs; 
}

Okay, at this time your mailbox will receive a password retrieval email from helloweba. There is a URL link in the email content. Click the link to reset. .php to verify email.

The code is as follows

include_once("connect.php");//連接數據庫 

$token = stripslashes(trim($_GET['token'])); 
$email = stripslashes(trim($_GET['email'])); 
$sql = "select * from `t_user` where email='$email'"; 

$query = mysql_query($sql); 
$row = mysql_fetch_array($query); 
if($row){ 
$mt = md5($row['id'].$row['username'].$row['password']); 
if($mt==$token){ 
if(time()-$row['getpasstime']>24*60*60){ 
$msg = '該鏈接已過期！'; 
}else{ 
//重置密碼... 
$msg = &#39;請重新設置密碼，顯示重置密碼表單，<br/>這裏只是演示，略過。&#39;; 
} 
}else{ 
$msg = &#39;無效的鏈接&#39;; 
} 
}else{ 
$msg = &#39;錯誤的鏈接！&#39;; 
} 
echo $msg;

reset.php first accepts the parameters email and token, and then queries whether the email exists in the data table t_user based on the email. If it exists, obtain the user's information, and communicate with sendmail The token combination method in .php constructs the token value in the same way, and then compares it with the token passed by the URL. If the difference between the current time and the time when the email is sent is more than 24 hours, it will prompt "The link has expired!", otherwise, then It indicates that the link is valid and redirects to the password reset page. Finally, the user sets a new password.

Summary: Through registered email verification and password retrieval via email in this article, we know the application of sending emails in website development and its importance. Of course, SMS verification applications are also popular now, which require related SMS interfaces. Just connect.

Finally, attach the data table t_user structure:

The code is as follows

CREATE TABLE `t_user` ( 
`id` int(11) NOT NULL auto_increment, 
`username` varchar(30) NOT NULL, 
`password` varchar(32) NOT NULL, 
`email` varchar(50) NOT NULL, 
`getpasstime` int(10) NOT NULL, 
PRIMARY KEY (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

smtp.class.php class file

The code is as follows

<?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("(^|(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(www.bitsCN.com): $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, 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 hostn");
}

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 . "rn" . $body);

$this->smtp_debug("> " . str_replace("rn", "n" . "> ", $header . "n> " . $body . "n> "));

return true;
}

function smtp_eom() {
fputs($this->sock, "rn.rn");

$this->smtp_debug(". [EOM]n");

return $this->smtp_ok();
}

function smtp_ok() {
$response = str_replace("rn", "", fgets($this->sock, 512));

$this->smtp_debug($response . "n");

if (!ereg("^[23]", $response)) {
fputs($this->sock, "QUITrn");

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 . "rn");

$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("([ trn])+", "", $address);

$address = ereg_replace("^.*<(.+)>.*$", "1", $address);

return $address;
}

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

There is a database connection class at the end, which will not be introduced here. You can find the relevant database connection mysql class on this site

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