Question

我试图弄清楚为什么我的重置＆＃34;重启＆＃34;按钮不能正常工作，因为增加的猜测仍在上升。如果有人放弃，我还需要添加一个显示正确数字的按钮。感谢先前警告的帮助，这些是我坚持的两个部分。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Guessing Game</title>
</head>
<body>
<center><form action="game.php" method="POST">
Guess a number 1-100:<input type="text" name="userGuess"/>
<input type="submit" value="Guess"/>
<center><form action="game.php">
<input type="reset" value="Restart"/>
</form></center>
</body>
</html>

<?php
session_start();

$_SESSION['randNum'] = isset($_SESSION['randNum']) ? $_SESSION['randNum'] : rand(0, 100);
$_SESSION['guesses'] = isset($_SESSION['guesses']) ? $_SESSION['guesses'] : 0;

$randNum = $_SESSION['randNum'];
$userGuess = $_POST['userGuess'];
$userGuess = filter_input(INPUT_POST, "userGuess");

if (isset($randNum)) {
    if ($userGuess<$randNum) {
            echo "<center>You guessed too low!</center>";
            $_SESSION['guesses']++;
            echo $_SESSION['guesses'];
        }
    if ($userGuess>$randNum) {
            echo "<center>You guessed too high!</center>";
            $_SESSION['guesses']++;
            echo $_SESSION['guesses'];
        }
    if ($userGuess==$randNum) {
            echo "<center>Congratulations You're right!!!</center>";
                         unset($_SESSION["randNum"], $_SESSION['guesses']);
    }
    if ($userGuess>100 || $userGuess<0) {
            echo "<center>Please enter a number betweeen 1 and 100!</center>";
    }
}
else {
    echo "Please enter a number between 1 and 100";
}

?>

Answer 1

当您第一次访问该页面时，没有POST数据;这几乎只是一个正常的请求。但是，当您提交表单时，POST数据会随请求一起发送，然后$_POST包含userGuess。

只需在代码周围添加if (isset($_POST['userGuess']))即可解决问题：

if (isset($_POST['userGuess'])) {
    $userGuess = $_POST['userGuess'];
    // ...

Answer 2

为什么不使用

if (filter_input(INPUT_POST, "userGuess") != null)
{

}

或

$userGuess = filter_input(INPUT_POST, "userGuess");

这会将$ userGuess设置为null，而不是未定义;

<强>更新

你的计数器是用PHP（后端）设置的，你不能使用重置按钮重置它们而不是重新加载页面。

结果按钮的答案很简单。创建按钮

<input type="button" value="Answer" onclick="Alert('<?php echo $randNum; ?>')" />

其余的，做一点研究......

无法在PHP中删除警告

2 个答案: