PHP realizes automatic login by remembering password

PHP realizes automatic login by remembering password_PHP tutorial

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Release： 2016-07-20 11:10:14

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To realize the function of remembering passwords and logging in automatically, most of our data is implemented by using cookies on the client side. Our use of PHP is no exception. Friends in need can refer to it.

The solution for PHP to remember passwords and automatically log in is actually the operation of sessions and cookies
//Check whether the user is logged in

} } } }

The code is as follows

代码如下

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function checklogin(){ if(empty($_SESSION ['user_info'])){ //Check whether the session is empty

代码如下

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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']){
$err_msg = "验证码不正确";
}elseif($username=='' || $password==''){
$err_msg = "用户名和密码都不能为空";
}else{
$row = getUserInfo($username,$password);

if(empty($row)){
$err_msg = "用户名和密码都不正确";
}else{
$_SESSION['user_info'] = $row;
if(!empty($remember)){ //如果用户选择了，记录登录状态就把用户名和加了密的密码放到cookie里面
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");
}
}
}

if(empty($_COOKIE['username']) || empty($_COOKIE['password'])){ //If session Is empty, and the user did not choose to record the login status

header("location:login.php?req_url=".$_SERVER['REQUEST_URI']); //Go to the login page, record the requested url, and jump after login Turn over, the user experience is good.
}else{ //The user has chosen to remember the login status

$user = getUserInfo($_COOKIE['username'],$_COOKIE['password']); // Get the user's personal information

if(empty($user)){ //The username and password are incorrect and the information is not retrieved. Go to the login page
header("location:login.php?req_url=".$_SERVER['REQUEST_URI']) ;

}else{

代码如下	复制代码
function logout(){ unset($_SESSION['user_info']); if(!empty($_COOKIE['username']) \|\| !empty($_COOKIE['password'])){ setcookie("username", null, time()-360024365); setcookie("password", null, time()-360024365); } }

$_SESSION['user_info'] = $user; //The username and password are correct, put the user’s personal information in the session

} } Second, the user submits login information

The code is as follows

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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']){ $err_msg = "Verification code is incorrect"; }elseif($username=='' || $password==''){ $err_msg = "Neither username nor password can be empty"; }else{ $row = getUserInfo($ username,$password); if(empty($row)){ $err_msg = "Both the username and password are incorrect"; }else{ $_SESSION['user_info '] = $row; if(!empty($remember)){ //If the user chooses, record the login status and put the username and encrypted password 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"); } } } Third, when the user clicks to exit, clear the recorded login status //Exit Login

The code is as follows

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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); } }