douzhun4124 2018-03-15 03:28
浏览 88

多个页面中$ _POST中的数据

I am new to PHP and I wrote scripts for simple login. When successfully login and click the link "back to login", I was not able to have the previous login username filled. I know using $_COOKIE['username'] for the value of username works, but I am wondering why $_POST['username'] does not work? Thank you!

login.php

<!DOCTYPE HTML>
<html>
<head></head>
<body>

<form action="./loginProcess.php" method="post">
  Username: <input type="text" name="username" value="<?php echo isset($_POST['username']) ? htmlspecialchars($_POST['username']) : ''; ?>"><br>
  Password: <input type="password" name="password"><br>
  <input type="submit" name="send">
</form>

</body>
</html>

loginProcess.php

<?php
echo "welcome,  ".$_POST['username'].", login success!!";
echo "<br/><a href='login.php'>Back to login</a><br>";
if(!empty($_COOKIE['lastVist'])){
    echo "your last login time：".$_COOKIE['lastVist'];
    setcookie("lastVist",date("Y-m-d H:i:s"),time()+24*3600*30);
}else{
    echo "you first login time：";
}
setcookie("username", $_POST['username'], time()+24*3600*30);
?>
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2条回答 默认 最新

  • dongpaocuan7498 2018-03-15 03:49
    关注

    A session is a way to store information (in variables) to be used across multiple pages.

    Unlike a cookie, the information is not stored on the users computer and unlike post as it has information for specific request sent by user.

    When we use an application, we open it and do some changes, then we close it. This is much like a Session, so to preserve information we have per session global array in php $_SESSION.

    A session is started with the session_start() function and values are stored in simply associative array fashion $_SESSION['key'] = $value;.

    login.php

    <?php
session_start();
?>
<!DOCTYPE HTML>
<html>
<head></head>
<body>

<form action="./loginProcess.php" method="post">
  Username: <input type="text" name="username" value="<?php echo isset($_SESSION['username']) ? htmlspecialchars($_SESSION['username']) : ''; ?>"><br>
  Password: <input type="password" name="password"><br>
  <input type="submit" name="send">
</form>

</body>
</html>

    loginProcess.php

    <?php
session_start();

echo "welcome,  ".$_POST['username'].", login success!!";
echo "<br/><a href='login.php'>Back to login</a><br>";
if(isset($_SESSION['lastVisit'])){
    echo "your last login time：".$_SESSION['lastVisit'];
}else{
    echo "you first login time：".$_SESSION['lastVisit'];
    $_SESSION['lastVisit'] = date("Y-m-d H:i:s", time());
}

$_SESSION['username'] = $_POST['username'];
?>
    评论

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