How to use PHP to display and hide button permissions

With the popularity and development of the Internet, more and more website applications are developed using the PHP language. During the development of a website, it is often necessary to assign different permissions to different users to manage and protect information. This article will discuss how to use PHP to display and hide button permissions.

In some website applications, some buttons can only be displayed and operated by users with specific permissions. For example, administrators can view and edit all pages and content on the website, while ordinary users can only view page content and leave messages, but cannot edit or delete them. Therefore, the website needs to dynamically display or hide buttons on the page according to the user's permission settings.

In order to display and hide button permissions, a user table needs to be created in the database to store the user's basic information and permissions. For example, the user table includes fields such as user ID, user name, password, and permissions. On this basis, a program is written in PHP language to read the user's permission information and dynamically display or hide buttons according to permission settings.

The following are the steps to display and hide button permissions.

1. Create database table

Create a user table named "users" in the MySQL database, which includes the following fields:

• user_id: User ID
• username: Username
• password: Password
• email: Email
• role: Permission level

Among them, the specific permission level needs to be set according to actual needs. For example, a permission level of 0 represents an ordinary user, and a permission level of 1 represents an administrator.

2. PHP connection database

Connect to the MySQL database through the PHP program, read the user information in the user table and save it to the $users array. An example is as follows:

<?php
//数据库连接配置
$servername = "localhost";
$username = "root";
$password = "123456";
$dbname = "testdb";

//创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

//检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

//读取用户信息
$sql = "SELECT * FROM users";
$result = $conn->query($sql);
$users = array();
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        $users[] = $row;
    }
}

$conn->close();
?>

3. Dynamic display or hiding of buttons

In the HTML page, create a button and dynamically display or hide the button according to the user's permission settings. An example is as follows:

<?php
foreach($users as $user) {
  if($user[&#39;username&#39;] == &#39;admin&#39; && $user[&#39;role&#39;] >= 1) {
    //只有管理员才显示
    echo '<button>编辑</button>';
  } else if($user['role'] >= 0) {
    //普通用户和管理员都显示
    echo '<button>查看</button>';
  } else {
    //没有权限的用户不显示
    continue;
  }
}
?>

Through the above code, buttons can be dynamically displayed or hidden according to different user permissions. The specific display and hiding methods can be determined according to actual needs.

Summary

To realize the display and hiding of button permissions through PHP, you need to connect to the database, read user information, set permission levels, and dynamically display or hide buttons according to the permission levels. By following the above steps, you can make your website application more secure and manageable.

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