20191115PHP cookie Login instance

The first is the login page

<form action="" method="post">
    <input type="text" name="uname"><br />
    <input type="password" name="psw"><br />
    <input type="submit" name="btn" value="登录">

</form>

<? PHP
 IF ( isset ( $ _POST [ 'BTN' ])) {
     $ the uname = $ _POST [ 'the uname' ];
     $ PSW = $ _POST [ 'PSW' ];
     IF ( $ the uname == "Tom" && $ PSW == 123 ) {
         echo "login is successful, after 2 seconds goto ............" ;
         the setcookie ( 'the uname', $ the uname );
         header ( "Refresh: 2; the index.php URL =" );
    } The else {
         echo "<Script> Alert ( 'username password is wrong!') </ Script>" ;
    }
    
}

?>

Then the main page

? < PHP
 IF (! Isset ( $ _COOKIE [ 'the uname' ])) {
     echo "<Script> Alert ( 'the current user is not logged!'); The window.location = 'the login.php' </ Script>" ;
     Exit ;
}
echo  sizeof ();
 echo "You are." $ _COOKIE [ 'uname'] "Welcome!." ;

?>

<a href="quit.php">退出</a>

Exit pages control

<?php
setcookie('uname','',time()-10);
header("location:login.php");