用于HTML表单处理的PHP开关语句未按预期工作_Php_Html_Forms_Switch Statement

用于HTML表单处理的PHP开关语句未按预期工作

php html forms

用于HTML表单处理的PHP开关语句未按预期工作,php,html,forms,switch-statement,Php,Html,Forms,Switch Statement,我试图用一个简单的switch语句来处理我的表单，但是我的case语句被忽略了，除了在Chrome中出现并显示的默认消息之外，不管表单输入是什么。在Firefox中，当我点击submit时，它会进入层次结构中我的工作文件夹上方的根文件夹。谢谢你的帮助 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org /TR/xhtml1/DTD/xhtml1-transitional.dt

我试图用一个简单的switch语句来处理我的表单，但是我的case语句被忽略了，除了在Chrome中出现并显示的默认消息之外，不管表单输入是什么。在Firefox中，当我点击submit时，它会进入层次结构中我的工作文件夹上方的根文件夹。谢谢你的帮助

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org   /TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>A Simple Switch Form</title>
    </head>
<body> 

    <form name="GetForm" action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="POST">
        1) What are the colors of the U.S. Flag?
        <br>
        <input type="radio" name="Question1" value="a" />
        a) red, white and blue
        <br />
        <input type="radio" name="Question1" value="b" />
        b) yellow, red and blue
        <br />
        <input type="radio" name="Question1" value="c" />
        c) blue, green and amber
        <br>
        <input type="submit" value="GO" />
        <input type="reset" value="RESET" />
    </form>
</body>
</html> 
<?

switch ($_POST['Question1']) {
case 'a':
    echo "You are correct.";    
    break;
case 'b':
    echo "Your answer is incorrect";
    break;
case 'c':
    echo "Your answer is incorrect";
    break;
case '':
    echo "Please enter a response to the question.";
    break;
default:
    echo "Welcome to my simplest of php SWITCH scripts";
    break;
}
?>


一种简单的开关形式
要重定向到文件本身，只需使用action=“？”
（或不执行任何操作）
然后最好使用长PHP标记：为什么要设置动作？默认操作是selfIt's$\u POST
，而不是$POST，我只是觉得自己像个白痴，但谢谢你让我克服了这一点。我已经更新了上面的代码，现在默认消息不显示-ideas？此外，“重置”按钮根本不起作用，即使我手动刷新浏览器，上一个表单条目中的消息也会保留在页面上。再次感谢你的帮助！在两个define语句中加引号。显然，通知的php错误报告没有打开，否则您会注意到它。无论如何，这对我来说是有效的。抱歉-我没有使用这两个定义语句-应该在这个问题上删除它们。Iserni-这些都没有帮助我解决问题，但谢谢。。。我正在使用Aptana Studio进行编辑。您使用什么查看结果？我已经把文件上传到服务器上，它正常工作了……我还复制了一个版本的代码。这些改变真的是表面上的，代码从一开始就工作了（除了一些警告和不识别缺失的答案）。这并没有解决我的问题，远远超出了我的编码知识。我相信在某个时候我会很感激你的评论，但现在它们只会让我感到困惑。我很抱歉。不过，你就快到了。我已经修改了我的注释代码，以便更好地解释它背后的含义。请随时评论、修改或与我联系。
define('ERROR',  ...

    </form>
<?php

define('ERROR', 'No answer was input for this question. Please select and answer.');
define('GREETING', 'Welcome to my simplest of php forms.');

if (!array_key_exists('Question1', $_POST)) {
    exit(); // We're just displaying the form.
}

switch ($_POST['Question1']) {
    ...
}
?>
</body>
</html>

// Create an "answer" array from _POST. Missing entries will be added with
// a default value.

$answer = array_merge(array(
     'Question1'   => '',
     'Question2'   => '',
), $_POST);

switch($answer['Question1']) {

default:
    print "<pre>Something strange happened, this is _POST:";
    var_dump($_POST);
    exit();

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org   /TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head><title>A Simple Switch Form</title></head>
<body>
    <form name="GetForm" method="POST">
        1) What are the colors of the U.S. Flag?
        <br /><input type="radio" name="Question1" value="a" />a) red, white and blue
        <br /><input type="radio" name="Question1" value="b" />b) yellow, red and blue
        <br /><input type="radio" name="Question1" value="c" />c) blue, green and amber
        <br /><input type="submit" name="cmd" value="GO" /><input type="reset" value="RESET" />
    </form>
<?php

define('ERROR', 'No answer was input for this question. Please select and answer.');
define('GREETING', 'Welcome to my simplest of php forms.');

/*
    The $_POST array always exists. If this page is loaded standalone, it will be
    empty. If it is loaded as reaction to a question being answered, we need a way
    to tell. It can't be the question itself, because if it was left blank, then
    we could not tell between the "standalone" and "empty answer" cases.
    So we add a field that we're sure will always be transmitted, linked to the
    submit button, by naming this button "cmd".
    Now, the presence of "cmd" in $_POST will tell us that a question has been
    answered (or attempted). Its absence will tell that we just need to show the
    question for the first time.
*/
if (!array_key_exists('cmd', $_POST)) {
    // Just showing the form.
    echo GREETING;
} else {
    // "cmd" is present, so we know that a question has been attempted.
    // Has it been answered? Now we need to check for this.
    if (!array_key_exists('Question1', $_POST)) {
        // Did not answer.
        // We replace "no answer" (Question1 not found) with "empty answer"
        // (Question1 equal to '') so that we can treat "no-answer" as any other answer.
        $_POST['Question1'] = '';
    }
    switch ($_POST['Question1']) {
        case 'a':
            echo "You are correct.";
            break;
        // b and c elicit the same reaction, so the two switch cases can be
        // written together.
        case 'b':
        case 'c':
            echo "Your answer '{$_POST['Question1']}' is incorrect";
            break;
        case '':
            echo ERROR;
            break;
        default:
            // We should not be here, because from the form one can only send
            // a, b or c, and if he does none, we receive the empty string.
            // However, it is good policy to foresee a "default" case and intercept
            // possible unforeseen circumstances.
            echo GREETING;
            break;
    }
}
?>
</body>
</html>