PHP无法执行查询寄存器。\u new

我的笔记本电脑上运行着

wamp

服务器，

phpmyadmin

正在运行，我正在尝试创建一个允许人们注册的网站。但是当我转到

register\u new.php

文件时，我得到以下错误：

Warning: mysqli::mysqli(): (HY000/1045): Access denied for user 'user'@'localhost' (using password: YES) in C:\wamp\www\db_fns.php on line 4
Call Stack
#   Time    Memory  Function    Location
1   0.0150  138784  {main}( )   ...\register_new.php:0
2   0.0191  172744  register( ) ...\register_new.php:40
3   0.0191  172760  db_connect( )   ...\user_auth_fns.php:10
4   0.0191  173720  mysqli ( )  ...\db_fns.php:4

Warning: mysqli_query(): Couldn't fetch mysqli in C:\wamp\www\user_auth_fns.php on line 13
Call Stack
#   Time    Memory  Function    Location
1   0.0150  138784  {main}( )   ...\register_new.php:0
2   0.0191  172744  register( ) ...\register_new.php:40
3   0.0860  173952  mysqli_query ( )    ...\user_auth_fns.php:13

我得到

无法执行查询作为警告

在我的
register\u new.php
文件中，我有：

<?php
error_reporting(E_ALL);
ini_set("display_errors", 1);
  // include function files for this application
  require_once('require_fns.php');

  //create short variable names
  $email=$_POST['email'];
  $username=$_POST['username'];
  $passwd=$_POST['passwd'];
  $passwd2=$_POST['passwd2'];
  // start session which may be needed later
  // start it now because it must go before headers
  session_start();
  try   {
    // check forms filled in
    if (!filled_out($_POST)) {
      throw new Exception('You have not filled the form out correctly. Please go back and try again.');
    }

    // email address not valid
    if (!valid_email($email)) {
      throw new Exception('That is not a valid email address.  Please go back and try again.');
    }

    // passwords not the same
    if ($passwd != $passwd2) {
      throw new Exception('The passwords you entered do not match. Please go back and try again.');
    }

    // check password length is ok
    // ok if username truncates, but passwords will get
    // munged if they are too long.
    if (!preg_match('/^(?=.*\d)(?=.*[A-Za-z])[0-9A-Za-z]{6,12}$/', $passwd)) {
        throw new Exception('Your password must be between 6 and 12 characters inclusive. Please go back and try again.');
    }

    // attempt to register
    // this function can also throw an exception
    register($username, $email, $passwd);
    // register session variable
    $_SESSION['valid_user'] = $username;

    // provide link to members page
    do_html_header('Registration successful');
    echo "Welcome " . $_POST["username"];
    echo 'Your registration was successful.';
    do_html_url('member.php', 'Go to members page');

   // end page
   do_html_footer();
  }
  catch (Exception $e) {
     do_html_header('Warning:');
     echo $e->getMessage();
     do_html_footer();
     exit;
  }
?>

另外，我必须连接到数据库的代码是

<?php

function db_connect() {
   $result = new mysqli('localhost','user','password');
   if (!$result) {
     throw new Exception('Could not connect to database server');
   } else {
     return $result;
   }
}

?>

EDIT2

它仍然不工作
问题在于您的服务器登录凭据。您提供了错误的用户名和密码，因此无法连接到数据库

默认用户名和登录名通常为：

Username : 'root'

Password : '' // Empty string.

在db_connect（）函数中更改登录凭据

<?php

function db_connect() {
   $result = new mysqli('localhost','root','');
   if (!$result) {
     throw new Exception('Could not connect to database server');
   } else {
     return $result;
   }
}

?>


register（）函数的后代码too@Saty
register（）
函数在那里，它是
寄存器（$username，$email，$passwd）line@smithster这不是寄存器函数的代码，该行只是调用函数。我们需要函数register（）@AlanTan的实际代码。我会将其编辑到问题中。共享您的连接代码，DB连接不正确。
Username : 'root'

Password : '' // Empty string.

<?php

function db_connect() {
   $result = new mysqli('localhost','root','');
   if (!$result) {
     throw new Exception('Could not connect to database server');
   } else {
     return $result;
   }
}

?>