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我正在学习 php 并使用“控制面板”创建一个基本站点。现在，我在尝试获取注册用户数量时遇到代码错误。 我的数据库:
-- phpMyAdmin SQL Dump
-- version 4.2.12deb2+deb8u2
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Jul 25, 2017 at 06:10 PM
-- Server version: 5.5.55-0+deb8u1
-- PHP Version: 5.6.30-0+deb8u1
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
--
-- Database: `login`
--
-- --------------------------------------------------------
--
-- Table structure for table `users`
--
CREATE TABLE IF NOT EXISTS `users` (
`user_id` int(11) NOT NULL,
`user_uname` varchar(256) NOT NULL,
`user_email` varchar(256) NOT NULL,
`user_pwd` varchar(256) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1;
--
-- Dumping data for table `users`
--
INSERT INTO `users` (`user_id`, `user_uname`, `user_email`, `user_pwd`) VALUES(1, 'Test1', 'johndoe@mail.com', 'HashedPassword');
--
-- Indexes for dumped tables
--
--
-- Indexes for table `users`
--
ALTER TABLE `users`
ADD PRIMARY KEY (`user_id`);
--
-- AUTO_INCREMENT for dumped tables
--
--
-- AUTO_INCREMENT for table `users`
--
ALTER TABLE `users`
MODIFY `user_id` int(11) NOT NULL AUTO_INCREMENT,AUTO_INCREMENT=2;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
index.php文件是
<?php
include dbh.inc.php;
?>
<html>
<head>
<title>Sidebar-Test</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<link rel="stylesheet" type="text/css" href="css/flaticon.css">
</head>
<body>
<div id="header">
<div class="logo"><a href='#'>Side<span>Source</span></a></div>
</div>
<div id="container">
<div class="sidebar">
<ul id="nav">
<li><span class="flaticon-graphic"></span><a href="#">Dashboard</a></li>
<li><span class="flaticon-download"></span><a href="#">Download</a></li>
<li><span class="flaticon-settings-work-tool"></span><a href="#">Settings</a></li>
</ul>
</div>
<div class="content">
<h1>Dashboard</h1>
<div id="box1" class="box">
<h3>Users</h3>
<p id="Box1P">
<?php
$sql = "select COUNT(user_id) registered_users from users";
$result = mysqli_query($conn, $sql) or die ("Query error!");
while ($row = mysqli_fetch_array($result)) {
$var = $row['registered_users'];
echo "There are currently " .$var. " users.";
}
?>
</div>
</div>
</div>
</body>
</html>和 dbh.inc.php:
<?php
$dbServername = "localhost";
$dbUsername = "root";
$dbPassword = "";
$dbName = "login";
$conn = mysqli_connect($dbServername, $dbUsername, $dbPassword, $dbName);
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}我试过错误报告，但是 mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT); 没有返回任何内容，但是在 phpmyadmin 中输入 select COUNT(user_id) registered_users from users 会返回
注册用户
1.
任何帮助将不胜感激!