注意：未定义索引：用户名在 C:\xampp\htdocs\Registration\scripts\validate.php 第 6 行
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Notice: Undefined index: username in C:\xampp\htdocs\Registration\scripts\validate.php on line 6
提问by user3725685
I am trying to register a new user by posting their form data to the database via a php scriptregister.phpbut I am getting an array of errors when I hit register, the data is supposed to be validated by a second script called validate.php. My register.phpis shown below. Same errors exist when the form is empty and when is filled.
我正在尝试通过 php 脚本将表单数据发布到数据库来注册新用户，register.php但是当我点击注册时我收到了一系列错误，数据应该由名为validate.php. 我register.php的如下所示。表单为空和填写时存在相同的错误。
<?php require('scripts/validate.php');?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Register</title>
<body>
<div id="mainWrapper">
<div id="register">
<?php if(isset($error)){echo "<div id='error'>".$error."</div>";}?>
<?php if(isset($success)){echo "<div id='success'>".$success."</div>";}?>
<form method="post" action="" >
<fieldset>
<legend>Register Here</legend>
<p>
<label for="Username">Username</label>
<input type="text" id="username"/>
</p>
<p>
<label for="Email">Email</label>
<input type="text" id="email"/>
<p>
<label for="Firstname">Firstname</label>
<input type="text" id="firstname"/>
</p>
<p>
<label for="Lastname">Lastname</label>
<input type="text" id="lastname"/>
</p>
<p>
<label for="Password">Password</label>
<input type="password" id="password"/>
</p>
<p>
<label for="Re-Type Password">Re-Type Password</label>
<input type="password" id="password2"/>
</p>
<p>
<label for="DOB">DOB</label>
<input type="text" id="dob">
</p>
<p>
<label for="Adress">Adress</label>
<input type="text" id="address"/>
</p>
<p>
<label for="Adress 2">Adress 2</label>
<input type="text" id="address2"/>
</p>
<p>
<label for="town">Town</label>
<input type="text" id="town"/>
</p>
<p>
<label for="county">County</label>
<input type="text" id="county"/>
</p>
<p>
<label for="Postalcode">PostalCode</label>
<input type="text" id="postcode"/>
</p>
<p>
<label for="contactno">Contact No.</label>
<input type="text" id="contact"/>
</p>
<input type="submit" name="submit" value="Register"/>
</fieldset>
</form>
</div>
</div>
</body>
</html>
And the validate.php is here
而validate.php就在这里
<?php include('connection.php');?>
<?php
if(isset($_POST['submit']))
{
$username=$_POST['username'];
$email=$_POST['email'];
$firstname=$_POST['firstname'];
$lastname=$_POST['lastname'];
$password=$_POST['password'];
$password2=$_POST['password2'];
$dob=$_POST['dob'];
$address=$_POST['address'];
$address2=$_POST['address2'];
$town=$_POST['town'];
$county=$_POST['county'];
$postcode=$_POST['postcode'];
$contact=$_POST['contact'];
$fetch=mysql_query("SELECT id FROM users WHERE email='$email'")or die(mysql_error());
$num_rows=mysql_num_rows($fetch);
if(empty($username)||empty($email) || empty($firstname) || empty($lastname) || empty($password) || empty($password2) || empty($dob) || empty($address) || empty($town)|| empty($postcode) || empty($contact))
{
$error= 'ALl * fields are required';
}
elseif (!filter_var($email,FILTER_VALIDATE_EMAIL))
{
$error= 'A valid email is required';
}
elseif (!empty($contact))
{
if (!is_numeric($contact))
{
$error= 'Enter a valid contact No.';
}
}
elseif ($password !=$password2)
{
$error= "Passwords don't match";
}
elseif ($num_rows >=1)
{
$error='We already have this email registered,try a new one!';
}
else
{
$password=md5($password);
$sql=mysql_query("INSERT INTO user(username,email,firstname,lastname,password,dob,address,address2,town,county,postcode,contact)VALUES('$username','$email','$firstname','$lastname','$password','$dob','$address','$address2','$town','$county','$postcode','$contact')");
if($sql)
{
header("location:login.php");
}
}
}
?>
I'll greatly appreciate guys.
我将不胜感激。
回答by Albzi
Give your inputs a nameproperty.
给你的inputsaname财产。
E.g:
例如：
<input type="text" id="username" name="username" />
The issue is that it's looking for name, but it doesn't exist.
问题是它正在寻找name，但它不存在。
This goes for all of your inputfields, not just that specific one and not just for type="text".
这适用于您的所有input领域，而不仅仅是那个特定领域，而不仅仅是type="text".
回答by edcs
When you POST data using a form, you need to specify the name of the data using the nameattribute. Replace all of the idattributes with nameand your form will work. For example:
当您使用表单 POST 数据时，您需要使用name属性指定数据的名称。用 替换所有id属性，name您的表单将起作用。例如：
<input type="text" id="username"/>
<input type="text" id="username"/>
should become:
应该变成：
<input type="text" name="username"/>
<input type="text" name="username"/>
回答by v2solutions.com
Replace all elements' id with name. When form is submitted the element's information is submitted with associated name and not id.
e.g. <input type="text" id="username" name="username"/>
用名称替换所有元素的 id。当表单被提交时，元素的信息是用关联的名称而不是 id 提交的。例如<input type="text" id="username" name="username"/>
回答by Scarraban
This isn't a PHP error, it's a HTML one.
这不是 PHP 错误，而是 HTML 错误。
POSTS variables are stated using the nametag in HTML, not the idtag.
POSTS 变量使用nameHTML 中的标签来表示，而不是id标签。
Your inputs should look like this:
您的输入应如下所示：
<input type="text" name="username"/>
Just change the idtags to nametags, and it should work.
只需将id标签更改为name标签，它应该可以工作。
回答by Sathya Baman
Change your HTML Form
更改您的 HTML 表单
<?php require('scripts/validate.php');?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Register</title>
<body>
<div id="mainWrapper">
<div id="register">
<?php if(isset($error)){echo "<div id='error'>".$error."</div>";}?>
<?php if(isset($success)){echo "<div id='success'>".$success."</div>";}?>
<form method="post" action="scripts/validate.php" >
<fieldset>
<legend>Register Here</legend>
<p>
<label for="Username">Username</label>
<input type="text" id="username" name="username"/>
</p>
<p>
<label for="Email">Email</label>
<input type="text" id="email" name="email"/>
<p>
<label for="Firstname">Firstname</label>
<input type="text" id="firstname" name="firstname"/>
</p>
<p>
<label for="Lastname">Lastname</label>
<input type="text" id="lastname" name="lastname"/>
</p>
<p>
<label for="Password">Password</label>
<input type="password" id="password" name="password"/>
</p>
<p>
<label for="Re-Type Password">Re-Type Password</label>
<input type="password" id="password2" name="password2"/>
</p>
<p>
<label for="DOB">DOB</label>
<input type="text" id="dob" name="dob">
</p>
<p>
<label for="Adress">Adress</label>
<input type="text" id="address" name="address"/>
</p>
<p>
<label for="Adress 2">Adress 2</label>
<input type="text" id="address2" name="address2"/>
</p>
<p>
<label for="town">Town</label>
<input type="text" id="town" name="town"/>
</p>
<p>
<label for="county">County</label>
<input type="text" id="county" name="county"/>
</p>
<p>
<label for="Postalcode">PostalCode</label>
<input type="text" id="postcode" name="postcode"/>
</p>
<p>
<label for="contactno">Contact No.</label>
<input type="text" id="contact" name="contact"/>
</p>
<input type="submit" name="submit" value="Register"/>
</fieldset>
</form>
</div>
</div>
</body>
</html>
回答by jfh6
as others have stated here, your form elements need a name attribute. the id attribute is great for referencing the form elements in JavaScript or CSS. but with $_POST variables you need to specify the name. Hope this gives an understanding to why you need the name attribute instead of the id attribute.
正如其他人在此处所述，您的表单元素需要一个 name 属性。id 属性非常适合在 JavaScript 或 CSS 中引用表单元素。但是对于 $_POST 变量，您需要指定名称。希望这能让您理解为什么需要 name 属性而不是 id 属性。
