How to build the backend of WeChat applet in PHP

With the increasing popularity of WeChat mini programs, more and more developers have begun to get involved in the development of WeChat mini programs. However, when developing WeChat mini programs, it is inevitable to encounter problems with back-end construction. This article will introduce in detail how to build the backend of WeChat applet in PHP.

Step 1: Install the PHP environment
Before you start building the backend of the WeChat applet, you first need to install the PHP environment on your local computer so that you can run the PHP code. Before installing the PHP environment, you need to install Apache or Nginx server. Take the Apache server as an example. After installation, install the PHP environment through the following command:
sudo apt-get install php7.0

Note: The above command is applicable to Ubuntu system, other operating systems can refer to the corresponding The command.

After the installation is complete, you can check the PHP version through the following command:
php -v

Step 2: Create a database
Before building the backend of the WeChat applet, you need First create a MySQL database. Databases can be created through phpMyAdmin or the MySQL command line. Take phpMyAdmin as an example. After logging in to phpMyAdmin, select "Create New Database", enter the database name, select the encoding set and sorting rules, and finally click "Create".

Step 3: Configure database connection
After creating the database, you need to configure the database connection in the PHP code. You can first create a database connection file, configure the database connection information in the file, and then reference the file in all PHP files. The following is a simple database connection file example:

$conn = mysqli_connect("localhost", "root", "123456", "test");
if (!$conn) {
    die("连接数据库失败：" . mysqli_connect_error());
}

?>

Step 4: Write PHP code
After completing the above steps, It's time to start writing PHP code. When developing the backend of a WeChat applet, it is usually necessary to implement the following functions:
1. Implement the addition, deletion, modification and query of data
2. Implement the login function
3. Implement the upload image function
4. With Interacting with WeChat API

The following takes a simple example as an example to introduce how to write PHP code. First, you need to call the API in the WeChat applet and pass parameters to the PHP file. The following is an example code for passing parameters to a PHP file:
wx.request({
url: 'http://localhost/demo.php',
data: {

name: 'xiaoming',
age: '18'

},
success: function(res){

console.log(res.data)

}
})

The code to receive parameters in the PHP file is as follows:

$name = $_POST['name'];
$age = $_POST['age'];
echo "姓名：" . $name . " 年龄：" . $age;

?>

When the PHP file successfully receives the parameters, it can perform related operations. The following is a sample code for inserting data into the database:

header("Content-type: text/html; charset=utf-8"); //设置编码
require_once('db_conn.php'); //引用数据库连接文件

$name = $_POST['name'];
$age = $_POST['age'];
$sql = "INSERT INTO student (name, age) VALUES ('$name', '$age')"; //SQL语句
if(mysqli_query($conn,$sql)){
    echo "插入成功";  
}else{
    echo "插入失败：" . mysqli_error($conn);
}

?>

In the above code, the database connection file is first quoted, and then the SQL statement is Insert data into the database.

Step 5: Test
After writing the PHP code, you need to test it. Testing can be done through tools such as Postman, or in WeChat mini programs. The following is a sample code for testing PHP code in a WeChat applet:
wx.request({
url: 'http://localhost/demo.php',
data: {

name: 'xiaoming',
age: '18'

},
success: function(res){

console.log(res.data)

}
})

Through the above code, pass parameters to the PHP file in the WeChat applet, and Receive return value.

Summary:
When developing the backend of a WeChat applet, you need to first install the PHP environment, create a database and configure the database connection, then write PHP code to implement relevant functions, and finally verify the correctness of the code through testing sex. I hope this article can help beginners build the backend of WeChat mini programs.

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