Question

这是一个1到100之间的随机数猜测游戏。

我被困在猜测数字部分。代码不起作用，不管我说的是什么，只是告诉我信息＆＃34;你的号码更低！＆＃34;。我需要帮助。

这是我到目前为止所做的。

<?php

$x   = rand(1, 100);
$num = '';

if (isset($_POST['submit'])) {


        if ($num < $x) 
        {
            echo " Your number is lower! <br />";
        } elseif ($num > $x) 
            {
            echo " Your number is higher! <br />";
        } elseif ($num == $x) 
            {
            echo " Congratulations! You guessed the hidden number. <br />";
        } else 
            {
            echo " You never set a number! <br />";
        }




}
?>
<p>
<form action="" method="post">
<input type="text" name="num">
<button type="submit" name="submit">Guess</button>
<button type="reset" name="Reset">Reset</button>
</form>
</p>

Answer 1

您需要在提交表单后设置num。

if (isset($_POST['submit'])) {
    $num = $_POST['num'];
    if ($num < $x) 
    {
       echo " Your number is lower! <br />";
    } elseif ($num > $x) 
    {
        echo " Your number is higher! <br />";
    } elseif ($num == $x) 
    {
        echo " Congratulations! You guessed the hidden number. <br />";
    } else 
    {
        echo " You never set a number! <br />";
    }
}

Answer 2

你总是会变得更低，因为你value内没有任何$num。所以，你需要指定$num

 <?php

    $x   = rand(1, 100);
    $num = '';

    if (isset($_POST['submit'])) {
     $num = $_POST['num']; // Add this to set value for $num variable
            if ($num < $x) 
            {
                echo " Your number is lower! <br />";
            } elseif ($num > $x) 
                {
                echo " Your number is higher! <br />";
            } elseif ($num == $x) 
                {
                echo " Congratulations! You guessed the hidden number. <br />";
            } else 
                {
                echo " You never set a number! <br />";
            }
    }
    ?>

Answer 3

// value of $x is in between 1 and 100 means greater than 0 and lesser than 101
$x   = rand(1, 100);
// $num value is empty and while you attempt to compare with this this will converted to zero
$num = '';
// thus $num<$x always returns true, thats the mistake you need to assign the submitted value to the $num variable like  
$num=$_POST['num'];
// put above line just before the if($num<$x)

Answer 4

如果你将它作为switch/case语句使用，那将会容易得多：

$x = rand(1,1000);
if(isset($_POST['submit'])) {
    $num = $_POST['num'];
    switch($num) {
        case ($num < $x):
        echo " Your number is lower! <br />";
        break;
        case ($num > $x):
        echo " Your number is higher! <br />";
        break;
        case ($num == $x):
        echo " Congratulations! You guessed the hidden number. <br />";
        break;
        case '':
        echo " You never set a number! <br />";
        break;
    }
}

Example/Demo

Answer 5

您已设置$num = ''（修复空字符串）并将其与随机生成的数字进行比较。很明显，这不起作用。你必须在PHP中阅读$_POST['num']。

然而，这不会像预期的那样有用。您需要将随机数存储在session中，或者更轻松地向表单添加隐藏字段。否则随机数将在每次尝试时改变。

Answer 6

在 2021 年 6 月 22 日，我使用 PHP 编写了一个范围内的猜数 [0 .. aMaxIntValue] 示例 Web 应用程序。我认为以下代码可能对您有所帮助。代码保存在单个 PHP 文件中。它生成 #4 HTML 页面 ...

第一个初始页面用于收集应用程序参数（例如要猜测的最大整数数）
第二页是主游戏页面，要求用户猜测密码或重置游戏。此页面显示了之前的用户猜测以及一些给用户的猜测提示
第三页用于通知用户输掉比赛（即他没有更多的尝试机会了）
第4页用于通知用户赢得游戏（即猜对了）
留给用户的尝试次数是使用值范围 [0 .. max] 计算的
要猜的秘密数字是一个随机生成的整数

这是 PHP + HTML 代码...

    <? php ?>
    <? php ?>

<?php

    session_start();

    error_reporting (E_PARSE | E_COMPILE_ERROR);

    function ResetGame()
    {
        unset ( $_SESSION['theMaxNumber'] );
    }

    function InitGame()
    {
        $_SESSION['theNumberToGuess'] = mt_rand (0, $_SESSION['theMaxNumber']);

        $_SESSION['theMaxNumberOfTries'] = floor ( log ($_SESSION['theMaxNumber'], 2) ) + 1;

        $_SESSION['theUserTriesCount'] = 0;

        $_SESSION['thePrevGuessesString'] = '';

        $_SESSION['theUserGuess'] = 0;
    }

    function ComputeNumberOfTriesLeft()
    {
        return $_SESSION['theMaxNumberOfTries'] - $_SESSION['theUserTriesCount'];
    }

    function IsNoMoreTriesLeft()
    {
        return ComputeNumberOfTriesLeft() <= 0;
    }

    $aCanPlayGame = false;

    $aUserSubmittedGuess = false;

    $aIsNoMoreTriesLeft = false;

    if ($_SERVER['REQUEST_METHOD'] == 'POST') {

        if ( isset ($_REQUEST['playgame']) ) {

            $_SESSION['theMaxNumber'] = intval($_REQUEST['theMaxNumber']);

            // init game ...
            InitGame();

            $aCanPlayGame = true;

        }
        elseif ( isset ($_REQUEST['submituserguess']) ) {

            $aCanPlayGame = true;

            $aUserSubmittedGuess = true;

            $_SESSION['theUserGuess'] = intval($_REQUEST['theUserGuess']);

        }
        elseif ( isset ($_REQUEST['resetgame']) ) {

            ResetGame();

        }
        else {
            ResetGame();
        }

    }
    else {
        ResetGame();
    }

    // check a play

    $aUserShouldTryLower = false;
    $aUserShouldTryHigher = false;

    $aUserWins = false;

    $aUserLooses = false;

    if ($aCanPlayGame) {

        $aIsNoMoreTriesLeft = IsNoMoreTriesLeft();

        if ( ! $aIsNoMoreTriesLeft ) {

            // user have tries left

            if ($aUserSubmittedGuess) {

                // check user guess ...
                $aUserGuess = intval($_SESSION['theUserGuess']);

                if ( $aUserGuess > $_SESSION['theNumberToGuess'] ) {

                    $aUserShouldTryLower = true;

                }
                elseif ( $aUserGuess < $_SESSION['theNumberToGuess'] ) {

                    $aUserShouldTryHigher = true;

                }
                else {

                    $aUserWins = true;

                    // also reset game
                    ResetGame();

                }

                // add the current guess to the prev guesses string
                $_SESSION['thePrevGuessesString'] .= $_SESSION['theUserGuess'] . ' ';

                // increase the user tries count
                ++ $_SESSION['theUserTriesCount'];

                // check tries count
                if ( ! $aUserWins ) {

                    $aIsNoMoreTriesLeft = IsNoMoreTriesLeft();

                    if ($aIsNoMoreTriesLeft) {
                        // this was the last try

                        // no more tries left
                        $aUserLooses = true;

                        // also reset game
                        ResetGame();
                    }

                }
            }

        }
        else {
            // no more tries left
            $aUserLooses = true;

            // also reset game
            ResetGame();
        }

    }

?>

<?php if ($aUserLooses): ?>

<!DOCTYPE html>
<html>
<head>
    <title>Guess a Number</title>
</head>
<body>
    <p>Sorry, you loose the game</p>
    <p>the Number to Guess was <?php echo $_SESSION['theNumberToGuess']; ?></p>
    <form method="post">
        <input type="submit" name="resetgame" value="reset game">
    </form>
</body>
</html>

<?php elseif ($aUserWins): ?>

<!DOCTYPE html>
<html>
<head>
    <title>Guess a Number</title>
</head>
<body>
    <p>Congrats, you Win the Game</p>
    <p>the Number to Guess was <?php echo $_SESSION['theNumberToGuess']; ?></p>
    <form method="post">
        <input type="submit" name="resetgame" value="reset game">
    </form>
</body>
</html>

<?php elseif ($aCanPlayGame): ?>

<!DOCTYPE html>
<html>
<head>
    <title>Guess a Number</title>
</head>
<body>

    <p>the Max Number is <?php echo $_SESSION['theMaxNumber']; ?></p>
    <p>Guess a Number in the Range [ 0 .. <?php echo ($_SESSION['theMaxNumber']); ?> ]</p>
    <p>[DEBUG] the secret number to guess is <?php echo $_SESSION['theNumberToGuess']; ?></p>
    <p>you have <?php echo ComputeNumberOfTriesLeft(); ?> tries left</p>
    <form method="post">
        <label for="theUserGuess">Enter your Guess: </label>
        <input type="text" id="theUserGuess" name="theUserGuess">
        <input type="submit" name="submituserguess" value="Guess">
        <input type="submit" name="resetgame" value="reset game">
    </form>
    <p>Prev Guesses: <?php echo $_SESSION['thePrevGuessesString']; ?> </p>
    <p>
        <?php
            if ($aUserShouldTryLower) {
                echo 'you should try a lower < guess';
            }
            elseif ($aUserShouldTryHigher) {
                echo 'you should try a higher > guess';
            }
            else {
                echo 'no guess';
            }
        ?>
    </p>

</body>
</html>

<?php else: ?>

<!DOCTYPE html>
<html>
<head>
    <title>Guess a Number</title>
</head>
<body>

    <p>Guess a Number from (0) to ... </p>
    <form method="post">
        <input id="theMaxNumber" name="theMaxNumber">
        <input type="submit" name="playgame" value="play game">
    </form>

</body>
</html>

<?php endif; ?>

    <? php ?>

就是这样……

PHP猜数

6 个答案: