php表单提交但不显示错误或成功消息，直到形式重新加载为止

我有一个联系表格，我使用PHP来完成服务器端。

我遇到的问题是，当单击提交按钮时，表格正在提交，但未显示表单，错误消息或成功消息。

当我重新加载页面时，出现表单和适当的消息。

我看不到任何明确的理由，为什么这会有任何帮助！

<?php
// $error and $success variable set to blank 
$error = ""; 
$successMessage = "";
// check to see if any $_POST variables have been entered
if ($_POST) {
    // if $_POST variable ["email"] has no value
    if (!$_POST["email"]) {
        // $error variable to add comment advising that data is missing
        $error .= "An email address is required!!!!!!!!<br>";
    }
    if (!$_POST["subject"]) {
        $error .= "The subject field is required!!!!<br>";
    }
    if (!$_POST["content"]) {
        $error .= "The content field is required!!!!!<br>";
    }
    // IF $error variable is no longer empty 
    if ($error != "") {
        // $error variable to genereate html + $error 
        $error = '<div><p><strong>Whoops! There were error(s) in the form:</strong></p>' . $error . '</div>';
    } else {    
        $emailTo = "email@example.com";
        $subject = $_POST["subject"];
        $content = $_POST["content"]; 
        $headers = "From: ".$_POST["email"];
        // IF all email variables have had values assigned then $successMessage to display html sucess message
        if (mail($emailTo, $subject, $content, $headers)) {
        $successMessage = '<div>Thank you for your enquiry, we will get back to you shortly!</div>';
        // ELSE email variable(s) are missing a value - $error variable to display html error message
        } else {
        $error = '<div>Unfortuantely your enquiry could not be sent, please try again later</div>';
        }
    }
}
?>
<html>
<div id="contactOuter">
    <div id="contactInner">
            <a href="javascript:void(0);"><span id="close">&times;</span></a>
            <h1>Get in touch</h1>
            <div><? echo $error.$successMessage;?></div>
                <form method="post">
                    <label for="email">Email address:</label><br>
                    <input name="email" type="email"  placeholder="Enter email" id="email">
                    <label for="subject">Subject:</label>
                    <input name="subject" type="text" id="subject">
                    <label for="content">What would you like to ask us?</label><br>
                    <textarea name="content" rows="7" id="content"></textarea>
                    <button type="submit" id="submit">Submit</button>
                </form>
    </div>
</div>
</html>

edit：给定单击提交时表单也会消失的新信息，您可能会遇到PHP错误。请阅读有关PHP的白屏死亡屏幕并启用错误消息传递，以便您可以进行故障排除并查看可能遇到的错误。我可能还建议您研究Xdebug或其他一些工具，以便您可以浏览代码以确切查看发生了什么。

有一些问题。首先，始终使用<?php。那是从个人经历中。设置了一些服务器以无法识别<?相信与否。

第二，基于变量在屏幕上打印到屏幕时没有值的事实，我认为您不会进入状态块。尝试使用 if (isset($_POST["submit"])) {，然后做<button type="submit" id="submit" name="submit">Submit</button> - 注意：考虑到新信息甚至没有出现在表单上的新信息，但仍然是很好的做法。

如注释中所述，包括<body>标签。另外，请确保您包括其他建议的标记(例如<!DOCTYPE html>和<html lang="en">(。

也建议在表格上使用 action="file.php"属性。

<?php
// $error and $success variable set to blank 
$error = ""; 
$successMessage = "";
// check to see if any $_POST variables have been entered
if (isset($_POST["submit"])) {
    // if $_POST variable ["email"] has no value
    if (!$_POST["email"]) {
        // $error variable to add comment advising that data is missing
        $error .= "An email address is required!!!!!!!!<br>";
    }
    if (!$_POST["subject"]) {
        $error .= "The subject field is required!!!!<br>";
    }
    if (!$_POST["content"]) {
        $error .= "The content field is required!!!!!<br>";
    }
    // IF $error variable is no longer empty 
    if ($error != "") {
        // $error variable to genereate html + $error 
        $error = '<div><p><strong>Whoops! There were error(s) in the form:</strong></p>' . $error . '</div>';
    } else {    
        $emailTo = "email@example.com";
        $subject = $_POST["subject"];
        $content = $_POST["content"]; 
        $headers = "From: ".$_POST["email"];
        // IF all email variables have had values assigned then $successMessage to display html sucess message
        if (mail($emailTo, $subject, $content, $headers)) {
        $successMessage = '<div>Thank you for your enquiry, we will get back to you shortly!</div>';
        // ELSE email variable(s) are missing a value - $error variable to display html error message
        } else {
        $error = '<div>Unfortuantely your enquiry could not be sent, please try again later</div>';
        }
    }
}
?>
<html>
</body>
<div id="contactOuter">
    <div id="contactInner">
            <a href="javascript:void(0);"><span id="close">&times;</span></a>
            <h1>Get in touch</h1>
            <div><?php echo $error.$successMessage;?></div>
                <form method="post">
                    <label for="email">Email address:</label><br>
                    <input name="email" type="email"  placeholder="Enter email" id="email">
                    <label for="subject">Subject:</label>
                    <input name="subject" type="text" id="subject">
                    <label for="content">What would you like to ask us?</label><br>
                    <textarea name="content" rows="7" id="content"></textarea>
                    <button type="submit" id="submit" name="submit">Submit</button>
                </form>
    </div>
</div>
</body>    
</html>

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