Use PHP to develop question classification and tag recommendation functions in the knowledge question and answer website.

Use PHP to develop question classification and tag recommendation functions in knowledge Q&A websites

In the era of knowledge sharing, various types of knowledge Q&A websites have emerged. In order to help users find the questions they are interested in faster, question classification and tag recommendation functions are indispensable.

This article will introduce how to use PHP to develop question classification and tag recommendation functions in a knowledge question and answer website. We'll use a fictitious Q&A website as an example to demonstrate how to implement these features.

First, we need to create a database to store question and tag information. We can create the corresponding data table using the following SQL statement:

CREATE TABLE `questions` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `question` varchar(255) NOT NULL,
  `category_id` int(11) NOT NULL,
  PRIMARY KEY (`id`)
);

CREATE TABLE `categories` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
);

CREATE TABLE `tags` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
);

CREATE TABLE `question_tag` (
  `question_id` int(11) NOT NULL,
  `tag_id` int(11) NOT NULL,
  PRIMARY KEY (`question_id`, `tag_id`)
);

In our PHP application, we first need to connect to the database. This can be achieved using the following code:

$host = 'localhost';
$db = 'knowledge_qa';
$user = 'username';
$password = 'password';

$conn = new PDO("mysql:host=$host;dbname=$db", $user, $password);

Next, we can implement the problem classification function. Suppose we have a form containing questions and classification information. When the user submits a question, we can insert the question and classification information into the database:

function createQuestion($question, $category_id) {
  global $conn;

  $sql = "INSERT INTO questions (question, category_id) VALUES (:question, :category_id)";
  $stmt = $conn->prepare($sql);
  $stmt->bindParam(':question', $question);
  $stmt->bindParam(':category_id', $category_id);
  $stmt->execute();

  return $conn->lastInsertId();
}

Next, we can implement the tag recommendation function. Suppose we have a form that contains label information. The user can select an existing label or enter a new one. We can insert tag information into the database and establish an association with the question:

function createTag($name) {
  global $conn;

  $sql = "INSERT INTO tags (name) VALUES (:name)";
  $stmt = $conn->prepare($sql);
  $stmt->bindParam(':name', $name);
  $stmt->execute();

  return $conn->lastInsertId();
}

function attachTagToQuestion($question_id, $tag_id) {
  global $conn;

  $sql = "INSERT INTO question_tag (question_id, tag_id) VALUES (:question_id, :tag_id)";
  $stmt = $conn->prepare($sql);
  $stmt->bindParam(':question_id', $question_id);
  $stmt->bindParam(':tag_id', $tag_id);
  $stmt->execute();
}

The above is a basic code example of how to use PHP to implement question classification and tag recommendation functions in a knowledge Q&A website. When a user submits a question, we can call the above function to create an association between the question and the relevant tags.

When users browse the website, we can filter and recommend based on the classification and label information of the question. We can use the following code to get the list of questions under a specific category:

function getQuestionsByCategory($category_id) {
  global $conn;

  $sql = "SELECT * FROM questions WHERE category_id = :category_id";
  $stmt = $conn->prepare($sql);
  $stmt->bindParam(':category_id', $category_id);
  $stmt->execute();

  return $stmt->fetchAll(PDO::FETCH_ASSOC);
}

Similarly, we can also use a similar method to get the list of questions under a specific label:

function getQuestionsByTag($tag_id) {
  global $conn;

  $sql = "SELECT q.* FROM questions q INNER JOIN question_tag qt ON q.id = qt.question_id WHERE qt.tag_id = :tag_id";
  $stmt = $conn->prepare($sql);
  $stmt->bindParam(':tag_id', $tag_id);
  $stmt->execute();

  return $stmt->fetchAll(PDO::FETCH_ASSOC);
}

Through the above function, we It can realize the question classification and tag recommendation functions in the knowledge question and answer website. In this way, users can more easily find the questions they are interested in, thereby improving their learning effectiveness and satisfaction.

In actual development, we can further improve these functions, such as automatic recommendation of question-related tags and display of popular tags. These can be expanded and optimized based on specific needs.

I hope this article will be helpful to use PHP to develop question classification and tag recommendation functions in knowledge Q&A websites. Let’s start building an efficient and intelligent Q&A platform!

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