【发布时间】：2017-06-09 05:57:43
【问题描述】：
我有 2 页：
index.php
<?php session_start(); ?>
<!DOCTYPE html>
<html>
<head>
<title></title>
<link href="https://fonts.googleapis.com/css?family=Lato" rel="stylesheet">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div class="container">
<div class="wrapper">
<h1>Welcome to the Great Number Game!</h1>
<h3>I am thinking of a number between 1 and 100</h3>
<h3>Take a guess!</h3>
<?php
echo $_SESSION['message'];
?>
<form method="post" action="process.php">
<input type="hidden" name="action" value="guess">
<input type="text" name="number">
<br>
<input type="submit" value="Submit">
</form>
</div>
</div>
</form>
</body>
</html>
和process.php
<?php session_start(); ?>
<?php header('Location: index.php'); ?>
<?php
if (!isset($_SESSION["message"])) {
$_SESSION["message"] = "";
}
if(!isset($_SESSION['num'])) {
$_SESSION['num'] = rand(1, 100);
}
$new_game = "<a href='logout.php'><button class='btn'>Play again</button></a>";
if ($_POST['number']) {
$number = $_POST['number'];
if (is_numeric($_POST['number'])) {
if ($number > $_SESSION['num']) {
$_SESSION['message'] = "<div class='bad-guess'>Too high!</div>";
}elseif ($number < $_SESSION['num']) {
$_SESSION['message'] = "<div class='bad-guess'>Too low!</div>";
}else{
$_SESSION['message'] = "<div class='lucky-guess'>Congratulations! ".$_POST['number']." was the number!</div><br>".$new_game;
}
}else{
$_SESSION['message'] = "<div> <b>'$number'</b> is not a number. Please insert a number!</div>";
}
}
?>
问题是，然后我开始会话，我得到了我的 $_SESSION['message'] 索引未定义的错误。然后我开始猜数字，我得到了正确的信息。那么如何为会话开始定义 $_SESSION['message'] 呢？
【问题讨论】：
标签： php session session-variables