How to use PHP to implement the question and answer system of WeChat applet?

How to use PHP to implement the question and answer system of WeChat applet?

With the rapid development of WeChat mini programs, more and more developers are beginning to pay attention to how to implement interesting and practical functions in mini programs. As a common interactive function, the question and answer system can provide users with questions answers, knowledge sharing and other services. This article will introduce how to use PHP to implement the question and answer system of WeChat applet and provide detailed code examples.

Step 1: Create a database table

First, we need to create a database to store question and answer information. In MySQL, you can create a table named "questions" using the following code:

CREATE TABLE questions (
id int(11) unsigned NOT NULL AUTO_INCREMENT,
question varchar(255) NOT NULL,
answer text NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Step 2: Write PHP interface

Now, we will create a question and answer interface for querying questions and submitting answers. Create a file named "faq.php" on your server and use the following code to write the interface:

// Import the database configuration file
require_once 'config .php';

//Connect to the database
$conn = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);

if (mysqli_connect_errno()) {

echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit();

}

//Set the character set
mysqli_set_charset($conn, "utf8");

//Get the operation type (query a question or submit an answer)
$action = $_GET['action'];

// Query question
if ($action == 'getQuestion') {

// 获取随机问题
$sql = "SELECT * FROM questions ORDER BY RAND() LIMIT 1";
$result = mysqli_query($conn, $sql);
$question = mysqli_fetch_assoc($result);

// 返回问题JSON
echo json_encode($question);

}
// Submit answer
elseif ($action == 'submitAnswer') {

// 获取问题ID和答案
$questionId = $_POST['questionId'];
$answer = $_POST['answer'];

// 更新问题表的答案字段
$sql = "UPDATE questions SET answer='" . mysqli_real_escape_string($conn, $answer) . "' WHERE id=" . $questionId;
$result = mysqli_query($conn, $sql);

if ($result) {
    echo "Answer submitted successfully!";
} else {
    echo "Failed to submit answer!";
}

}

// Close the database connection
mysqli_close($conn);
?>

Step 3: Write the front-end code of the mini program

In the front-end code of the WeChat mini program, we can obtain questions and submit answers by calling the PHP interface. In the code of the mini program, you can refer to the following sample code:

// Get the question
wx.request({

url: 'https://your-domain.com/faq.php?action=getQuestion',
success: function(res) {
    console.log(res.data);
    // TODO: 处理问题数据
},
fail: function(res) {
    console.error(res);
}

});

// Submit the answer
wx.request({

url: 'https://your-domain.com/faq.php?action=submitAnswer',
method: 'POST',
data: {
    questionId: 1, // 问题ID
    answer: 'Your answer' // 答案内容
},
success: function(res) {
    console.log(res.data);
    // TODO: 处理提交答案的结果
},
fail: function(res) {
    console.error(res);
}

});

Step 4: Deploy the project

Finally, write the PHP file and the front end of the applet Upload the code to your server and configure the correct domain name and path. Make sure the database information in the database configuration file is correct and replace it with your interface URL in the applet code.

Summary:

Through the above steps, we can use PHP to implement the question and answer system of the WeChat applet. In this system, users can obtain random questions and submit answers. This is just a simple example, you can extend and optimize the functionality according to your needs. I hope this article can help you understand how to use PHP to create a question and answer system for WeChat mini programs.

Note: To ensure data security, it is recommended to perform permission verification on the interface and verify the legality of the answers.

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