Question

<?php

$strArray = array("supermarket", "programming", "development", "apache","university");

$index = isset($_POST['index']) ? $_POST['index'] : 0;
$message2 = str_shuffle($strArray[$index]);
if(!isset($_POST['guess'])){
    $message1="<h1>Welcome to the shuffle game!</h1></br>";
    $message2=str_shuffle($strArray[$index]);
}

elseif($_POST['guess'] == $strArray[$index]){   
    $message1="<h1>You guessed right!</h1></br>";
    $index++;
    $message2=str_shuffle($strArray[$index]);
}

elseif($_POST['guess'] != $strArray[$index]){
    $message1="<h1>You guessed wrong!</h1></br>";
}

?>
<!DOCTYPE html>
<html>
<head><title>Guess the word!</title></head>
<body>

<?php echo $message1; echo "<b>Try to guess the shuffled word: </b>" . $message2; ?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
<p><label for="guess">Enter your guess:</label>
<input type="text" id="guess" name="guess" /></p>
<input type="hidden" name="index" value="<?php echo $index; ?>">
<button type="submit" name="submit" value="submit">Guess</button>
</form></body></html>

这个游戏中的问题是索引......

从0开始，当它达到值5时，它会产生错误，因为显然数组的最后一个值被索引为4，所以数组中没有索引5 我试图用if语句来阻止它，但它导致了其他错误！任何解决方案？

Answer 1

您可以通过将$index与数组中的项目数进行比较来检查if ($index < count($strArray)) { // $index is valid } else { // $index is too big }是否过大：

$index

在选择下一个随机字符串时，在递增<?php $strArray = array("supermarket", "programming", "development", "apache","university"); $index = isset($_POST['index']) ? $_POST['index'] : 0; $message2 = str_shuffle($strArray[$index]); if(!isset($_POST['guess'])){ $message1="<h1>Welcome to the shuffle game!</h1></br>"; $message2=str_shuffle($strArray[$index]); } elseif($_POST['guess'] == $strArray[$index]){ $message1="<h1>You guessed right!</h1></br>"; if ($index < count($strArray) - 1) { $index++; } else { $index = 0; } $message2=str_shuffle($strArray[$index]); } elseif($_POST['guess'] != $strArray[$index]){ $message1="<h1>You guessed wrong!</h1></br>"; } ?>之前需要进行此检查。

你的php逻辑可以是看起来像这样：

$index

（旁注：实际上，您应该在第一次定义>= 0时开始检查，同时检查is_numeric并调用$_POST['index']。否则恶意用户可以发送curl -H @{"X-Api-Key" = "j65k423lj4k2l3fds"} -Method PUT 'https://some/working/file.xml'，例如“100”或“-1”或“foo”）。

Answer 2

在显示游戏表单之前，请检查$index是否已达到阵列的长度。如果是这样，请显示一条消息，说明游戏已结束，而不是表单。

<?php

$strArray = array("supermarket", "programming", "development", "apache","university");

$index = isset($_POST['index']) ? $_POST['index'] : 0;
$message2 = str_shuffle($strArray[$index]);
if(!isset($_POST['guess'])){
    $message1="<h1>Welcome to the shuffle game!</h1></br>";
    $message2=str_shuffle($strArray[$index]);
}

elseif($_POST['guess'] == $strArray[$index]){   
    $message1="<h1>You guessed right!</h1></br>";
    $index++;
    if ($index < count($strArray)) {
        $message2=str_shuffle($strArray[$index]);
    }
}

elseif($_POST['guess'] != $strArray[$index]){
    $message1="<h1>You guessed wrong!</h1></br>";
}

?>
<!DOCTYPE html>
<html>
<head><title>Guess the word!</title></head>
<body>

<?php 
echo $message1; 
if ($index < count($strArray)) {
    ?>
    <b>Try to guess the shuffled word: </b>" <?php echo $message2; ?>
    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
    <p><label for="guess">Enter your guess:</label>
    <input type="text" id="guess" name="guess" /></p>
    <input type="hidden" name="index" value="<?php echo $index; ?>">
    <button type="submit" name="submit" value="submit">Guess</button>
    </form>
    <?php
} else {
    ?>
    <b>Game over!</b>
    <p><a href="<?php echo $_SERVER['PHP_SELF']; ?>">Play again</a></p>
    <?php
}
?>
</body></html>

猜猜游戏PHP

2 个答案: