好，所以我知道了：
<style type="text/css">
<!--
#frmFeedback {
display: <?php echo($myFormDisp); ?>;
}
-->
</style>
和此：
//hide form
$myFormDisp = "none";
所以...为什么不隐藏表格？
完整代码（已修订）：
<html>
<head>
<title>Feedback Form</title>
<!-- Modified by: Student Name -->
<!-- The page should accept user input in form values, then, after the form
is submitted, hide the form and reveal a confirmation message using
the data entered into the form elements. -->
</head>
<body>
<h1 align="center">We Need You!</h1>
<h2 align="center">Please provide us with your valuable feedback!</h2>
<hr>
<?php
while (!(isset($myName) || isset($myAge) || isset($myFav) || isset($myComments)))
{
$myName = "anonymous";
$myAge = "unspecified";
$myFav = "unspecified";
$myQuestion = "unspecified";
}
$mySubmit = isset($_POST['btnSubmit']);
?>
<form name="frmFeedback" id="frmFeedback" action="sendFeedback.php" method="post" <?php if ($mySubmit == "Send Feedback!") { echo ' style="display: none"'; } ?>>
Name: <input type="text" name="txtName">
<br>
<br>
Age: <select name="mnuAge">
<option value="youth">Youth</option>
<option value="teen">Teen</option>
<option value="adult">Adult</option>
<option value="senior">Senior</option>
</select>
<br>
<br>
What was your favorite page?
<br>
<input type="radio" name="radFav" value="ASP tutorial">ASP Tutorial
<br>
<input type="radio" name="radFav" value="JavaScript tutorial">JavaScript Tutorial
<br>
<input type="radio" name="radFav" value="PHP tutorial"> PHP Tutorial
<br>
<br>
Which pages did you visit?
<br>
<input type="checkbox" name="chkView[]" value="ASP tutorial">ASP Tutorial
<br>
<input type="checkbox" name="chkView[]" value="JavaScript tutorial">JavaScript Tutorial
<br>
<input type="checkbox" name="chkView[]" value="PHP tutorial"> PHP Tutorial
<br>
<br>
Do you have any additional scripting questions?
<br>
<textarea name="txaQuestions" wrap="soft" cols="50" rows="10">
</textarea>
<br>
<br>
<input type="submit" name="btnSubmit" value="Send Feedback!">
</form>
<?php
//Once the form elements have been filled in, extract data from form and store in variables
$myName = isset($_POST['txtName']);
$myAge = isset($_POST['mnuAge']);
$myFav = isset($_POST['rdFav']);
$myQuestion = isset($_POST['txaQuestions']);
if ($mySubmit == "Send Feedback!")
{
//hide form
//$myFormDisp = "none";
//display message
print("<h3 align='center'>Thank you!!</h3>");
print("Hello, ".$myName."!");
print("Thank you very much for your feedback on our tutorial site.");
print("The ".$myAge." age group is one of our most critical market segments, so we really appreciate the time you took to fill out our form. ");
print("Active web visitors like yourself are what make these pages possible. ");
print("We are very glad you enjoyed the ".$myFav." page.");
if (isset($_POST['chkView']))
{
print(", and hope that you found the other pages you viewed (");
foreach($_POST['chkView'] as $myView)
{
print("".$myView.", ");
}
print("etc.) to be just as helpful.");
}
else
{
print(". The next time you visit we hope you have a chance to view our other tutorials also.</p>");
}
print("<p>We will respond to your question: \"".$myQuestion."\" just as soon as we can</p>");
print("<h3 align='center' Thanks for stopping by!</h3>");
}
else
{
//set form to display
//$myFormDisp = "block";
}
?>
</body>
</html>
您在代码中的值分配已被注释掉。如果在现实中将其注释掉，则您的变量将永远无法获得display的值。我在您的代码中看不到style标记，但是假设有一个
<style type="text/css">
<!--
#frmFeedback {
display: <?php echo($myFormDisp); ?>;
}
-->
</style>
然后需要按顺序对$myFormDisp进行正确地评估。
您确定CSS呈现时已设置吗？也许在该CSS声明之前尝试<?php var_dump($myFormDisp); ?>。
此外，在不相关的旁注中，echo不需要括号：
// This is better form for echo statements:
<?php echo $myFormDisp; ?>
您可能需要：
<?php echo $myFormDisp; ?>