Php uses cookies to remember the logon status _ PHP Tutorial

Php uses cookies to remember the logon status. Php uses cookies to remember the logon status. This article mainly introduces how php uses cookies to remember the logon status. This article uses the original method to explain how to remember the logon status, three steps are provided. php uses cookies to remember the logon status.

This article mainly introduces how php uses cookies to remember the logon status. This article uses the original method to explain how to remember the logon status and provides three steps and specific implementation code, for more information, see

To implement the function of remembering automatic password logon, most of our data is implemented using cookies on the client. We use php, which is no exception. if you need it, please refer to it.

Php creates a solution for remembering the password for automatic login, that is, to operate sessions and cookies.

1. check whether the user is logged on

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.
}
}
}
}

2. the user submits logon information

The code is as follows:

Username = trim ($ _ POST ['username']);
$ Password = md5 (trim ($ _ POST ['password']);
$ Validatecode = $ _ POST ['validatecode'];
$ Ref_url = $ _ GET ['req _ url'];
$ Remember = $ _ POST ['remember'];

$ Err_msg = '';
If ($ validatecode! = $ _ SESSION ['checksum']) {
$ Err_msg = "incorrect verification code ";
} Elseif ($ 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 ");
}
}
}

3. when the user points out, the logon status is cleared.

The code is as follows:

// Log out
Function logout (){
Unset ($ _ SESSION ['User _ info']);
If (! Empty ($ _ COOKIE ['username']) |! Empty ($ _ COOKIE ['password']) {
Setcookie ("username", null, time ()-3600*24*365 );
Setcookie ("password", null, time ()-3600*24*365 );
}
}

4. simplified version instances

The code is as follows:

// Read the COOKIE username and password value.
If ($ _ COOKIE ['uname']! = '') {$ CKUNAME = $ _ COOKIE ['uname'];}
If ($ _ COOKIE ['pwd']! = '') {$ CKPWD = $ _ COOKIE ['pwd'];}
Echo $ CKUNAME;
Echo'
';
Echo $ CKPWD;
?>

// Log on and save the user name and password to the COOKIE
If ($ _ POST ['click']! = ''){
$ Uname = $ _ POST ['uname'];
$ Pwd = $ _ POST ['pwd'];
// If the entered encryption password is different from that in the COOKIE, it will be encrypted
If ($ pwd! = $ CKPWD) {$ pwd = md5 ($ pwd );}
$ Remember = $ _ POST ['remember'];
If ($ remember = 1 ){
Setcookie ("uname", $ uname, time () + 3600*24*30 );
Setcookie ("pwd", $ pwd, time () + 3600*24*30 );
}
}
?>

Ghost This article mainly introduces how php uses cookies to remember the logon status. This article uses the original method to explain how to remember the logon status. three steps are provided...