变量存在，但给出一个未定义的变量错误
问题描述：
这真的让我......我不断收到一个未定义的变量，即使它在那里！ 我该如何摆脱这个错误？何况我甚至不能确定形式的作品，因为使用而不是活的服务器上XAMPP变量存在，但给出一个未定义的变量错误
表上contact.php
<div class="col-md-6 col-md-offset-3 emailForm">
<?php if (isset($result)) { echo "$result";} ?>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<div class="form-group">
<label for="name">Your Name:</label>
<input type="text" name="name" class="form-control" value="<?php echo isset($_POST['name']) ? $_POST['name'] : ''; ?>" />
</div>
<div class="form-group">
<label for="subject">Subject:</label>
<input type="text" name="subject" class="form-control" value="<?php echo isset($_POST['name']) ? $_POST['subject'] : ''; ?>" />
</div>
<div class="form-group">
<label for="email">Your Email Address:</label>
<input type="email" name="email" class="form-control" value="<?php echo isset($_POST['name']) ? $_POST['email'] : ''; ?>" />
</div>
<div class="form-group">
<label for="message">Your Message:</label>
<textarea class="form-control" rows="5" name="message"><?php echo isset($_POST['name']) ? $_POST['message'] : ''; ?></textarea>
</div>
<div class="text-center">
<input type="submit" name="submit" class="btn btn-success btn-lg" value="Submit"/>
</div>
</form>
<!-- Contact Form Ends -->
</div>
sendemail.php代码
<?php
if(isset($_POST["submit"])) {
if (!$_POST['name']) {
$error="<br />Please enter your name";
}
if (!$_POST['subject']) {
$error.="<br />Please enter a subject";
}
if (!$_POST['email']) {
$error.="<br />Please enter your email address";
}
if (!$_POST['message']) {
$error.="<br />Please enter a message";
}
if ($_POST['email']!="" AND !filter_var($_POST['email'],FILTER_VALIDATE_EMAIL)) {
$error.="<br />Please enter a valid email address";
}
if ($error) {
$result='<div class="alert alert-danger"><strong>There were error(s) in your form:</strong>'.$error.'</div>';
} else {
if (mail("[email protected]", "New Online Message!", "Name: ". $_POST['name']."
Name: ".$_POST['name']."
Subject: ".$_POST['subject'])) {
$result='<div class="alert alert-success text-center"><strong>Thank you!</strong> Please allow 24 to 48 hours for our support team to get back to you. Thank you. </div>';
} else {
$result='<div class="alert alert-danger">Sorry, there was an error sending your message. Please try again later.</div>';
}
}
}
?>
答
尝试与此代码：
<?php
$error = "";
if(isset($_POST["submit"])) {
if ($_POST['name'] == "") {
$error .="<br />Please enter your name";
}
if ($_POST['subject'] == "") {
$error.="<br />Please enter a subject";
}
if ($_POST['email'] == "") {
$error.="<br />Please enter your email address";
}
if ($_POST['message'] == "") {
$error.="<br />Please enter a message";
}
if ($_POST['email']!="" AND !filter_var($_POST['email'],FILTER_VALIDATE_EMAIL)) {
$error.="<br />Please enter a valid email address";
}
if ($error) {
$result='<div class="alert alert-danger"><strong>There were error(s) in your form:</strong>'.$error.'</div>';
} else {
if (mail("[email protected]", "New Online Message!", "Name: ". $_POST['name']."
Name: ".$_POST['name']."
Subject: ".$_POST['subject'])) {
$result='<div class="alert alert-success text-center"><strong>Thank you!</strong> Please allow 24 to 48 hours for our support team to get back to you. Thank you. </div>';
} else {
$result='<div class="alert alert-danger">Sorry, there was an error sending your message. Please try again later.</div>';
}
}
}
?>
答
您已经定义$ if变量中的错误变量它的作用域仅在if块中。在开始时在if块外定义它。
只有'！$ _ POST ['name']'（使用'='）才会设置'$ error'。否则，你可以使用'。='附加到'$ error'。你必须首先设置'$ error ='';'。这在一些服务器上工作的原因是因为您禁用了PHP通知。另请注意，您正在将电子邮件头添加到您的电子邮件中，允许任何人使用您的联系表单发送任何其他电子邮件（或者甚至上千封电子邮件）。 – h2ooooooo 2014-09-29 05:49:39
so $ if语句之前的错误??我不明白 – 2014-09-29 05:52:25
头是耶。甚至不知道如何在没有标题的情况下保护这种类型的电子邮件，我相信在这里要求任何人输入内容太多了。无论如何感谢您的支持。 – 2014-09-29 05:55:10