Question

我正在为我制作的简单数学游戏编写难度脚本。我创建了一个html表单，用户可以从1到5输入难度，通过if函数相应地分配难度。这可以正常工作但是在会话开始时难度变量尚未设置，这对于if函数没有问题，因为它以一个难以分配的else选项结束，使得游戏的默认难度为1.但是我我留下了未定义的变量错误，即使变量还需要调用。这是我写的，我似乎找不到解决这个问题的方法。

   session_start();
 echo ('<h2>Change Difficulty (1 to 5)</h2>' . '<br/>');
 echo "<form method = 'post'><input type='text' id='random' name='random' onChange='preventDefault();'></form>";
                if(isset($_POST['random'])) {
 if ($_POST['random'] == 1 or $_SESSION['diffculty'] == 1) {
    $randvalue = 10;
    echo 'Current Difficulty Is 1';
    $diffculty = 1;
} elseif($_POST['random'] == 2 or $_SESSION['diffculty'] == 2) {
    $randvalue = 100;
    echo 'Current Difficulty Is 2';
    $diffculty = 2;
} elseif($_POST['random'] == 3 or $_SESSION['diffculty'] == 3) {
    $randvalue = 1000;
    echo 'Current Difficulty Is 3';
    $diffculty = 3;
} elseif($_POST['random'] == 4 or $_SESSION['diffculty'] == 4) {
    $randvalue = 10000;
    echo 'Current Difficulty Is 4';
    $diffculty = 4;
} elseif($_POST['random'] == 5 or  $_SESSION['diffculty'] == 5) {
    $randvalue = 100000;
    echo 'Current Difficulty Is 5';
    $diffculty = 5;
} else {
    $randvalue = 10;
    echo 'current Difficulty is 1';
    $diffculty = 1;
}

 $_SESSION['randvalues'] = $randvalue;
 $_SESSION['difficulty'] = $diffculty;
 }

即使用户设置难度变量，即使分配了if变量，也会在if函数中调用的每行代码都会得到未定义的索引错误。

Answer 1

对会话应用isset并首先添加else case。

<?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

session_start();
echo ('<h2>Change Difficulty (1 to 5)</h2>' . '<br/>');


 echo "
 <form method = 'post'>
 <input type='text' id='random' name='random' onChange='preventDefault();'>
 </form>";

if(isset($_POST['random']) && isset($_SESSION['diffculty'])) {
    if ($_POST['random'] == 1 or $_SESSION['difficulty'] == 1) {
        $randvalue = 10;
        echo 'Current Difficulty Is 1';
        $difficulty = 1;
    } elseif($_POST['random'] == 2 or $_SESSION['difficulty'] == 2) {
        $randvalue = 100;
        echo 'Current Difficulty Is 2';
        $difficulty = 2;
    } elseif($_POST['random'] == 3 or $_SESSION['difficulty'] == 3) {
        $randvalue = 1000;
        echo 'Current Difficulty Is 3';
        $difficulty = 3;
    } elseif($_POST['random'] == 4 or $_SESSION['difficulty'] == 4) {
        $randvalue = 10000;
        echo 'Current Difficulty Is 4';
        $difficulty = 4;
    } elseif($_POST['random'] == 5 or  $_SESSION['difficulty'] == 5) {
        $randvalue = 100000;
        echo 'Current Difficulty Is 5';
        $difficulty = 5;
    } else {
        $randvalue = 10;
        echo 'current Difficulty is 1';
        $difficulty = 1;
    }

    $_SESSION['randvalues'] = $randvalue;
    $_SESSION['difficulty'] = $difficulty;
} else {
    $_SESSION['randvalues'] = 10;
    $_SESSION['difficulty'] = 1;
}

Answer 2

使用全局变量$_SERVER['PHP_SELF']

定义表单操作：到同一页面

echo "<form method = 'post'><input action=".$_SERVER['PHP_SELF']."type='text' id='random' name='random' onChange='preventDefault();'></form>";

分配变量时的Php未定义索引

2 个答案: