我正在尝试创建一个过程表单的PHP文件，该文件指示处理时所需的字段。我的代码是：
<html>
<head>
<style type="text/css">
.error{color: #FF0000;}
</style>
</head>
<body>
<?php
if(isset($_POST['fullname']) && $_POST['fullname'] != "") {
$fullname = $_POST['fullname'];
}
if(isset($_POST['email']) && $_POST['email'] != "") {
$email = $_POST['email'];
}
if(isset($_POST['feedback']) && $_POST['feedback'] != "") {
$text= $_POST['feedback'];
}
$nameErr = $emailErr = "";
$name = $email = "";
if ($_SERVER["REQUEST_METHOD"] == POST) {
if (empty($_POST["fullname"])){
$nameErr = "Name is required";
} else {
$name = test_input($_POST["fullname"]);
}
if (empty($_POST["email"])) {
$emailErr = "Email is required";
} else {
$email = test_input($_POST["email"]);
}
}
?>
<h1>Customer Feedback</h1>
<p1>Please tell us what you think</p1><br><br>
<form method='POST' action='<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>' >
<p1>Your name:</p1><br>
<input type="text" name="fullname" value="<?php echo $fullname; ?>"><br><br>
<p1>Your email address:</p1><br>
<input type="text" name="email" value="<?php echo $email; ?>"><br><br>
<p1>Your feedback:</p1><br>
<textarea rows="5" cols="50" name="feedback"><?php echo $text;?></textarea><br><br>
<input type="submit" Value="Send Feedback"><br><br>
<?php
error_reporting(E_ALL);
$name = $_POST['fullname'];
$email = $_POST['email'];
$feed = $_POST['feedback'];
if (empty($name))
{
echo "Please enter your name, email and feedback.";
}
if (empty($email))
{
echo "Please enter your email and feedback.";
}
if (empty($feed))
{
echo "Please enter feedback.";
}
if (!empty($name) && !empty($email) && !empty($feed))
{
echo "You have inserted the correct data";
}
?>
</form>
</body>
</html>
然而，当我在Chrome上运行它时，我收到服务器错误500，说
检索process_4.php时遇到网站并出错。它可能已关闭以进行维护或配置不正确。
我在这一点上做出的其他PHP文件都运行正常，我不知道为什么不这样做。