How to use session and cookie at the same time in php to save user login information

How to use session and cookie at the same time in php to save user login information_PHP tutorial

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Release： 2016-07-21 15:00:18

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Use session and cookie at the same time to save user login information
1. Database connection configuration page: connectvars.php

Copy code The code is as follows:

//The location of the database
define('DB_HOST', '127.0.0.1');
// Username
define('DB_USER', 'root');
//Password
define('DB_PASSWORD', '19900101');
//Database name
define('DB_NAME ','test') ;
?>

2. Login page: logIn.php

Copy code The code is as follows:

//Insert relevant information about connecting to the database
require_once 'connectvars.php';
//Start a session
session_start();
$ error_msg = "";
//If the user is not logged in, that is, when $_SESSION['user_id'] is not set, execute the following code
if(!isset($_SESSION['user_id'])){
if(isset($_POST['submit'])){//Execute the following code when the user submits the login form
$dbc = mysqli_connect(DB_HOST,DB_USER,DB_PASSWORD,DB_NAME);
$user_username = mysqli_real_escape_string( $dbc,trim($_POST['username']));
$user_password = mysqli_real_escape_string($dbc,trim($_POST['password']));
if(!empty($user_username)&& !empty($user_password)){
                                                                                                                                                                                                                                                                                       ; "."password = SHA('$user_password')";
                                                                                                                                                                                                                           ; Then set SESSION and COOKIE and perform page redirection at the same time
if(mysqli_num_rows($data)==1){
]=$ row['user_id'];
                      $_SESSION['username']=$row['username']; 60*24*30));
                                                                                                                                                 . ';
                    header('Location: '             ); and password to log in. '; 🎜>}else{//If the user is already logged in, jump directly to the logged in page
$home_url = 'loged.php';
header('Location: '.$home_url);
}Mismatch - Log In
/css" href="style.css" />
                                                                                -Judge by $_SESSION['user_id']. If the user is not logged in, the login form will be displayed, allowing the user to enter the user name and password-->
                                                                                                                                                                                                                                           . 'user_id'])){
                                                                                                                                                                                                                                                                                           _Server ['PHP_SELF'] means when the user submits the form, calling its own pHP file-& gt;
& lt; form method = "post" action = "& lt;? Php echo $ _Server ['php_seld'];? & Gt; ">
" 🎜>                                                 value="" />
/>
                                                                       🎜> ?>

3. Login page: logged.php

Copy code

The code is as follows:

//The session must be opened before using the variable value stored in the session
session_start();
//If the session does not exist is set, check whether the cookie is set
if(!isset($_SESSION['user_id'])){
if(isset($_COOKIE['user_id'])&&isset($_COOKIE['username'] )){

//Use cookie to assign value to session
; }
}//Use a session variable to check the login status

if(isset($_SESSION['username'])){ echo 'You are Logged as '.$ _SESSION['username'].'
';
echo ' Log Out('.$_SESSION['username'].')< /a>';}
/**In the logged in page, you can use the user's session such as $_SESSION['username'], * $_SESSION['user_id'] to query the database, and you can do many things.*/
?>

Rendering:

4. Logout session and cookie page: logOut.php (redirect to lonIn.php after logout)

Copy code

The code is as follows:

/**Log out the session and cookie pages at the same time*/
//Even when logging out, you must start a session first to access session variables 
session_start();
 //Use a session variable to check login status
if(isset($_SESSION['user_id'])){
 //To clear the session variable, set the $_SESSION super global variable to an empty array
 $_SESSION = array();
 //If there is a session cookie, delete it by setting the expiration time to 1 hour before
 if(isset($_COOKIE[session_name()])){ 
 setcookie(session_name(),'',time()-3600);
 }
 //Use the built-in session_destroy() function to call to cancel the session 
 session_destroy();
}
//At the same time, set the expiration time of each cookie to a time in the past so that they will be deleted by the system. The time is in seconds
setcookie('user_id','',time()-3600);
setcookie('username','',time()-3600);
//The location header causes the browser to redirect to another page
$home_url = 'logIn.php';
header ('Location:'.$home_url);
?>