PHP有问题，我正在用valdiation构建一个表单，但我一直收到这个错误：
指定的值"''u003Cbr/''u003E''n''n''u003Cb''u003ENotice''u003C/b''u003E:未定义的索引：位于''u003Cb ''u003EC:''xamplep''htdocs''navigation.php ''u003C/b ''u003E''u003E''u003Cb''u003E/b''u003Cbr/''u003E''n行的电子邮件"不是有效的电子邮件地址。
更多错误信息：
<form class="form-horizontal" role="form" method="post" action="navigation.tphp">
<div class="form-group">
<label for="name" class="col-sm-2 control-label">Name</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="name" name="name" placeholder="First & Last Name" value="<br />
<b>Notice</b>: Undefined index: name in <b>C:'xampp'htdocs'navigation.php</b> on line <b>113</b><br />
">
<br />
<b>Notice</b>: Undefined variable: errName in <b>C:'xampp'htdocs'navigation.php</b> on line <b>114</b><br />
<p class='text-danger'></p> </div>
</div>
<div class="form-group">
<label for="email" class="col-sm-2 control label">Email</label>
<div class="col-sm-10">
<input type="email" class="form-control" id="email" name="email" placeholder="example@domain.com" value="<br />
<b>Notice</b>: Undefined index: email in <b>C:'xampp'htdocs'navigation.php</b> on line <b>120</b><br />
">
<br />
<b>Notice</b>: Undefined variable: errEmail in <b>C:'xampp'htdocs'navigation.php</b> on line <b>121</b><br />
<p class='text-danger'></p> </div>
</div>
<div class="form-group">
<label for="message" class="col-sm-2 control-label">Message</label>
<div class="col-sm-10">
<textarea class="form-control" rows="4" name="message"><br />
<b>Notice</b>: Undefined index: message in <b>C:'xampp'htdocs'navigation.php</b> on line <b>127</b><br />
</textarea>
<br />
<b>Notice</b>: Undefined variable: errMessage in <b>C:'xampp'htdocs'navigation.php</b> on line <b>128</b><br />
<p class='text-danger'></p> </div>
</div>
<div class="form-group">
<label for="human" class="col-sm-2 control-label">2 + 3 = ?</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="human" name="human" placeholder="Your Answer" value="<br />
<b>Notice</b>: Undefined index: human in <b>C:'xampp'htdocs'navigation.php</b> on line <b>134</b><br />
">
<br />
<b>Notice</b>: Undefined variable: errHuman in <b>C:'xampp'htdocs'navigation.php</b> on line <b>135</b><br />
<p class='text-danger'></p> </div>
</div>
<div class="form-group">
<div class="col-sm-10 col-sm-offset-2">
<!-- Will be used to display an alert to the user -->
<br />
<b>Notice</b>: Undefined variable: result in <b>C:'xampp'htdocs'navigation.php</b> on line <b>141</b><br />
</div>
</div>
</form>
它所指的代码也是：
<form class="form-horizontal" role="form" method="post" action="navigation.tphp">
<div class="form-group">
<label for="name" class="col-sm-2 control-label">Name</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="name" name="name" placeholder="First & Last Name" value="<?php echo htmlspecialchars($_POST['name']); ?>">
<?php echo "<p class='text-danger'>$errName</p>"; ?>
</div>
</div>
<div class="form-group">
<label for="email" class="col-sm-2 control label">Email</label>
<div class="col-sm-10">
<input type="email" class="form-control" id="email" name="email" placeholder="example@domain.com" value="<?php echo htmlspecialchars($_POST['email']); ?>">
<?php echo "<p class='text-danger'>$errEmail</p>"; ?>
</div>
</div>
<div class="form-group">
<label for="message" class="col-sm-2 control-label">Message</label>
<div class="col-sm-10">
<textarea class="form-control" rows="4" name="message"><?php echo htmlspecialchars($_POST['message']); ?></textarea>
<?php echo "<p class='text-danger'>$errMessage</p>"; ?>
</div>
</div>
<div class="form-group">
<label for="human" class="col-sm-2 control-label">2 + 3 = ?</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="human" name="human" placeholder="Your Answer" value="<?php echo htmlspecialchars($_POST['human']); ?>">
<?php echo "<p class='text-danger'>$errHuman</p>"; ?>
</div>
</div>
<div class="form-group">
<div class="col-sm-10 col-sm-offset-2">
<!-- Will be used to display an alert to the user -->
<?php echo $result; ?>
</div>
</div>
</form>
验证代码：
if(!empty($_POST["submit"])) {
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
$human = intval($_POST['human']);
$from = 'Contact Form';
$to = 'schlitzws@gmail.com';
$subject = 'New Contact Message';
$body = "From: $name'n E-mail: $email'n Message:'n $message";
//Check if name has been entered
if(!$_POST['name']) {
$errName = 'This Form requires a Name';
}
//Check if email has been entered and is valid
if(!$_POST['email'] || !filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) {
$errEmail = 'This Form requires a valid Email';
}
//Check if message has been entered
if(!$_POST['message']) {
$errMessage = 'This Form requires a Message';
}
//Check if simple anti-spam is incorrect
if($human !== 5) {
$errHuman = 'Your Answer is in-correct';
}
//If there are no errors, send the email
if(!$errName && !$errEmail && !$errMessage && !$errHuman) {
if(mail ($to, $subject, $body, $from)) {
$result='<div class="alert alert-success">Thank You! I will be in touch</div>';
} else {
$result='<div class="alert alert-danger">Sorry there was an error sending your message. Please try again later</div>';
}
}
}
此外，如果代码与此有关，请提前感谢！
问题是您试图访问POST超级全局中不存在的值。要解决此问题，您需要运行isset()检查以查看该值是否存在。
例如。
if (isset($_POST["answerswer"])) { echo $_POST["answerswer"] }
您应该使用isset（）检查变量是否存在：
<?php
if (!empty($_POST["submit"])) {
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
$human = intval($_POST['human']);
$from = 'Contact Form';
$to = 'schlitzws@gmail.com';
$subject = 'New Contact Message';
$body = "From: $name'n E-mail: $email'n Message:'n $message";
//Check if name has been entered
if (!isset($_POST['name'])) {
$errName = 'This Form requires a Name';
}
//Check if email has been entered and is valid
if (!isset($_POST['email']) || !filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) {
$errEmail = 'This Form requires a valid Email';
}
//Check if message has been entered
if (!isset($_POST['message'])) {
$errMessage = 'This Form requires a Message';
}
//Check if simple anti-spam is incorrect
if (isset($human) && $human !== 5) {
$errHuman = 'Your Answer is in-correct';
}
//If there are no errors, send the email
if (!isset($errName) && !isset($errEmail) && !isset($errMessage) && !isset($errHuman)) {
if (mail($to, $subject, $body, $from)) {
$result = '<div class="alert alert-success">Thank You! I will be in touch</div>';
} else {
$result = '<div class="alert alert-danger">Sorry there was an error sending your message. Please try again later</div>';
}
}
}