In php, the example of remembering the next automatic login password and remembering the Automatic Login Password

In php, the example of remembering the next automatic login password and remembering the Automatic Login Password

When creating a website, you will often encounter the need to remember the password. The next time you log on automatically, you will not log on within one week, and you will not log on 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:

Copy codeThe 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.

Copy codeThe 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.
}
}
}
}

Php will log on automatically next time

It is generally determined by cookie to determine whether a user logs on or not. Therefore, this implementation usually relies on setting the cookie time to determine whether the user remains logged on, if you keep the cookie, set the time to a longer value. It can be set for a specific period of time, one day, one month, or one year.
Setcookie ("TestCookie", $ value, time () + 3600 );
Here, time () + 3600 is the time, which means that the logon status is maintained for an hour from now on.

How to remember the user name and password in php

SESSION and COOKIE are designed to solve this problem. You must keep using cookies on the local machine.