我的 register.php 文件正在运行，但是当单击提交按钮时。这是我收到的错误消息
Notice: Use of undefined constant username - assumed 'username' in C:\xampp\htdocs\Hamza\register.php on line 18
您已注册!返回登录页面
但是它没有将任何用户添加到数据库中，我做错了什么？我认为 INSERT INTO users VALUES 中的某些内容不正确。我四处寻找并花了两个小时解决它，但无法找出问题所在。任何帮助都会有用，谢谢。
注册.php文件
<?php
echo "<h1>Register</h1>";
$submit = @$_POST['submit'];
//form data
$fullname = strip_tags(@$_POST['fullname']);
$username = strip_tags(@$_POST['username']);
$password = strip_tags(@$_POST['password']);
$repeatpassword = strip_tags(@$_POST['repeatpassword']);
$date = date ("y-m-d");
if ($submit)
{
//check for existance
if ($fullname&&username&&$password&&$repeatpassword)
{
if ($password==$repeatpassword)
{
//check char length of username and fullname
if (strlen($username)>25||strlen($fullname)>25)
{
echo "Length of username or fullname is too long";
}
else
{
//check password length
if (strlen($password)>25||strlen($password)<6)
{
echo "Password must be between 6 and 25 characters";
}
else
{
//register the user!
// encrypt password
$password = md5($password);
$repeatpassword = md5($repeatpassword);
//open database
$connect = mysql_connect("localhost","root","");
mysql_select_db("phplogin"); //select database
$queryreg = mysql_query("
INSERT INTO users VALUES ('','".$fullname."','".$username."','".$password."','".$date."')
");
die ("You have been registered! <a href='index.php'>Return to login page</a>");
}
}
}
else
echo "Your passwords do not match!";
}
else
echo "Please fill in <b>all</b> fields!";
}
?>
<html>
<p>
<form action='register.php' method='POST'>
<table>
<tr>
<td>
Your full name:
</td>
<td>
<input type='text' name='fullname' value='<?php echo $fullname; ?>'
</td>
</tr>
<tr>
<td>
Choose a username:
</td>
<td>
<input type='text' name='username' value='<?php echo $username; ?>'
</td>
</tr>
<tr>
<td>
Choose a password:
</td>
<td>
<input type='password' name='password'>
</td>
</tr>
<tr>
<td>
Repeat your password:
</td>
<td>
<input type='password' name='repeatpassword'>
</td>
</tr>
</table>
<p>
<input type='submit' name='submit' value='Register'>
</form>
</html>
最佳答案
检查第 18 行:
if ($全名&&用户名&&$密码&&$重复密码)
您忘记为用户名添加$符号。
关于PHP 注册表未将用户添加到数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27469678/