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我正在继续写一个迷宫生成器来自学php...

我已经设置了一个会话和一个表格来收集名称和迷宫大小（5-20​​）。

在第一次运行时，效果很好，迷宫就生成了。

我希望进一步的会话是记住名称，但重新输入大小。

如果会话不是新的，我尝试使用另一种（不同的）表单，但它无法识别/运行它，并且出现错误，告诉我 $mazesize 是一个无法识别的索引。

代码：

<?php
session_start();
error_reporting(-1);
?>
<html>
<head>
</head>
<body>
<?php

include 'ClassFunc1.php';

//program functionality
if (!isset($_SESSION['name']) && !isset($_POST['name'])){
    //if no data, print form
        ?><table><tr>
        <form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post">
        <td>Name: </td><td><input type="text" name="name"></td></tr>
        <tr><td>Maze size (min 5 max 20): </td><td><input type="text" name="mazesize"></td></tr>
        <tr><td colspan="2" align="center"><input type="submit" name="submit" value="Submit"></td></tr>
        </form></table>
        <?php
}else if (!isset($_SESSION['name']) && isset($_POST['name']) && isset($_POST['mazesize'])){
        //if a session doesn't exist but the form has been submitted
        //check to see if the form has all required values
        //create a new session
        if(!empty($_POST['name'])){
        $_SESSION['name']=$_POST['name'];
        $_SESSION['start']=time();
        echo "Welcome, ".$_POST['name'].". A new session has been activated for you. Click <a href=".$_SERVER['PHP_SELF'].">here</a> to refresh the page.";
        if($_POST['mazesize']>20){
            $m_size=20;
        }elseif($_POST['mazesize']<5){
            $m_size=5;
        }else{
            $m_size=$_POST['mazesize'];
        }
        define("COL_MAX",$m_size);
        define("ROW_MAX",$m_size);
        run_maze($_POST['name']);
        close_down();
        }else{
            echo "ERROR. Please enter your name and a maze size";
        }
}else if (isset($_SESSION['name'])) {
        //if a previous session exists
        //calculate elapsed time since session start and now
        echo "Welcome back, ".$_SESSION['name'].". This session was activated ".round((time()-$_SESSION['start'])/60)." minute(s) ago. Click <a href=".$_SERVER['PHP_SELF'].">here</a> to refresh the page.<br />";
        echo "Current session ID: ".session_id();
    //Ask for a new maze size
        ?><table><tr>
        <form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post">
        <td>Maze size (min 5 max 20): </td><td><input type="text" name="mazesize"></td></tr>
        <tr><td colspan="2" align="center"><input type="submit" name="submit" value="Submit"></td></tr>
        </form></table>
        <?php
        if($_POST['mazesize']>20){
            $m_size=20;
        }elseif($_POST['mazesize']<5){
            $m_size=5;
        }else{
            $m_size=$_POST['mazesize'];
        }
    define("COL_MAX",$m_size);
    define("ROW_MAX",$m_size);
    run_maze($_POST['name']);
    close_down();
}

//session_destroy();


?>

“包含”文件是类、方法和函数。

我确定我做错了什么，有人可以帮忙吗？

非常感谢

预计到达时间：

（在 echo "ERROR... line 之后修改了代码）

    }else if (isset($_SESSION['name']) && !isset($_POST['n_mazesize'])) {
            //if a previous session exists but n_mazesize not set
            //calculate elapsed time since session start and now
            echo "Welcome back, ".$_SESSION['name'].". This session was activated ".round((time()-$_SESSION['start'])/60)." minute(s) ago. Click <a href=".$_SERVER['PHP_SELF'].">here</a> to refresh the page.<br />";
            echo "Current session ID: ".session_id();
        //Ask for a new maze size
            ?><table><tr>
            <form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post">
            <td>Maze size (min 5 max 20): </td><td><input type="text" name="n_mazesize"></td></tr>
            <tr><td colspan="2" align="center"><input type="submit" name="submit" value="Submit"></td></tr>
            </form></table>
            <?php
    }else if (!isset($_SESSION['name']) && isset($_POST['n_mazesize'])){
            //if a previous session exists and n_mazesize is set
            //calculate elapsed time since session start and now
            echo "Welcome back, ".$_SESSION['name'].". This session was activated ".round((time()-$_SESSION['start'])/60)." minute(s) ago. Click <a href=".$_SERVER['PHP_SELF'].">here</a> to refresh the page.<br />";
            echo "Current session ID: ".session_id();
            if(!empty($_POST['n_mazesize'])){
            if($_POST['n_mazesize']>20){
                $m_size=20;
            }elseif($_POST['n_mazesize']<5){
                $m_size=5;
            }else{
                $m_size=$_POST['n_mazesize'];
            }
        run_maze($_SESSION['name'], $m_size);
        close_down();
        }

    //session_destroy();
    }

    ?>
</body>
</html>

这要求尺寸，但在提交时返回一个空白屏幕:-(

4

1 回答 1

2

$_POST['mazesize'] 的值仅在提交表单时可用。您应该添加一个条件：

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // use posted data here
}
于 2012-05-14T15:22:54.317 回答