Example of remembering the password for next automatic login in php

This article describes how to implement the next automatic login with a password in php. This article uses cookies to implement the Remember password and automatic login function. For more information, see

This article describes how to implement the next automatic login with a password in php. This article uses cookies to implement the Remember password and automatic login function. For more information, see

When you create a website, you will often encounter the need to remember the password and log on automatically next time. This requires no logon within one week and no logon within one month. This function is generally implemented through cookies. This article will briefly explain how to use php to achieve this requirement. Of course, there are more than N methods to achieve this requirement.

The whole process is when you log on, if you choose to remember the password or do not log on within one week, after the user successfully logs on, store the data of a cookie for automatic logon to the user table of the database for verification at next automatic logon. If the verification succeeds, the system automatically logs on. Otherwise, you need to enter the user name and password to log on. The cookie value can be a random code.

The sample code is as follows:

The Code is as follows:

$ Username = trim ($ _ POST ['username']);
$ Password = md5 (trim ($ _ POST ['Password']);
$ Ref_url = $ _ GET ['req _ url'];
$ Remember = $ _ POST ['member']; // indicates whether to log on automatically.
$ Err_msg = '';
If ($ username = ''| $ password = ''){
$ Err_msg = "neither user name nor password can be blank ";
} Else {
$ Row = getUserInfo ($ username, $ password );
If (empty ($ row )){
$ Err_msg = "the user name and password are incorrect ";
} Else {
$ _ SESSION ['user _ info'] = $ row;
If (! Empty ($ remember) {// if the user chooses to log on, the user name and password added are recorded in the cookie.
Setcookie ("username", $ username, time () + 3600*24*365 );
Setcookie ("password", $ password, time () + 3600*24*365 );
}
If (strpos ($ ref_url, "login. php") === false ){
Header ("location:". $ ref_url );
} Else {
Header ("location: main_user.php ");
}
}
}

In addition, you must perform the following function checks before accessing each page of the website.

The Code is as follows:

// Check whether the user logs on
Function checklogin (){
If (empty ($ _ SESSION ['user _ info']) {// check whether the session is empty.
If (empty ($ _ COOKIE ['username']) | empty ($ _ COOKIE ['Password']) {// if the session is empty, the user does not select to log on.
Header ("location: login. php? Req_url = ". $ _ SERVER ['request _ URI ']); // go to the logon page and record the REQUEST url. After logging on, go to the logon page. The user experience is good.
} Else {// remember the logon status
$ User = getUserInfo ($ _ COOKIE ['username'], $ _ COOKIE ['Password']); // retrieves the user's personal data
If (empty ($ user) {// if the user name and password are incorrect, the information is not obtained. Go to the logon page.
Header ("location: login. php? Req_url = ". $ _ SERVER ['request _ URI ']);
} Else {
$ _ SESSION ['user _ info'] = $ user; // the user name and password are correct. Put the user's personal data in the session.
}
}
}
}