How to use PHP to implement the classification management function of CMS system

How to use PHP to implement the classification management function of the CMS system

Overview:
When developing a content management system (CMS), the classification management function is a very basic and important function. The category management function allows users to create, edit and delete various categories to better organize and manage the content of the website. This article will introduce how to use PHP to write a simple CMS category management function and provide code examples.

Step 1: Create database and table structure
First, we need to create a database to store classified data. Open phpMyAdmin or any other MySQL database management tool and create a database named "categories". Then create a table named "categories" in the database, which will contain the following fields:

• id: primary key, auto-increment
• name: category name
• parent_id: Parent category ID

Step 2: Connect to the database
In the PHP code, we need to connect to the database to perform various operations. The following is an example function to connect to the database:

<?php
function connectDB() {
  $servername = "localhost";
  $username = "root";
  $password = "";
  $dbname = "categories";

  $conn = new mysqli($servername, $username, $password, $dbname);

  if ($conn->connect_error) {
    die("连接数据库失败: " . $conn->connect_error);
  }

  return $conn;
}
?>

Step 3: Add a category
To add a new category, we need to provide a form that allows the user to enter the category name and select the parent category (if there is one if). Then, we need to write a PHP function to insert the new category into the database:

<?php
function addCategory($name, $parentId) {
  $conn = connectDB();

  $sql = "INSERT INTO categories (name, parent_id) VALUES ('$name', '$parentId')";

  if ($conn->query($sql) === TRUE) {
    echo "分类添加成功";
  } else {
    echo "分类添加失败: " . $conn->error;
  }

  $conn->close();
}
?>

Step 4: Edit Category
When editing a category, we need to display a form that contains the name and parent of the current category Classification (if any). Then, we need to write a PHP function to update the classification information in the database:

<?php
function editCategory($categoryId, $name, $parentId) {
  $conn = connectDB();

  $sql = "UPDATE categories SET name='$name', parent_id='$parentId' WHERE id='$categoryId'";

  if ($conn->query($sql) === TRUE) {
    echo "分类编辑成功";
  } else {
    echo "分类编辑失败: " . $conn->error;
  }

  $conn->close();
}
?>

Step 5: Delete the classification
When deleting a classification, we only need to provide the ID of the classification. Write a PHP function to delete the classification information in the database:

<?php
function deleteCategory($categoryId) {
  $conn = connectDB();

  $sql = "DELETE FROM categories WHERE id='$categoryId'";

  if ($conn->query($sql) === TRUE) {
    echo "分类删除成功";
  } else {
    echo "分类删除失败: " . $conn->error;
  }

  $conn->close();
}
?>

Step 6: Display the classification
Finally, we need to write a PHP function to get the classification data from the database and display it on the web page :

<?php
function getCategories() {
  $conn = connectDB();

  $sql = "SELECT id, name, parent_id FROM categories";
  $result = $conn->query($sql);

  if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
      echo "分类ID: " . $row["id"]. " - 名称: " . $row["name"]. " - 父级分类ID: " . $row["parent_id"]. "<br>";
    }
  } else {
    echo "暂无分类";
  }

  $conn->close();
}
?>

The above are the steps to use PHP to implement the classification management function of the CMS system. With the above sample code, you can easily start developing your own CMS project and adjust and extend it according to actual needs. Hope this article helps you!

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