How to use PHP to develop the QR code generation function of public accounts

How to use PHP to develop the QR code generation function of public accounts

The prevalence of social media today has made public accounts one of the important channels for enterprises to interact with users. In order to attract more users to pay attention to official accounts, companies often use QR codes to make it easier for users to scan and follow. This article will introduce how to use PHP to develop the QR code generation function of public accounts and provide specific code examples.

1. Get the QR code generation address
   Before using PHP to develop the QR code generation function of the public account, we first need to obtain the QR code generation address. The QR code generation address can be obtained through the interface provided by the WeChat public platform. The following is a code example to obtain the QR code generation address:

<?php
$appid = "your_app_id";  // 公众号的AppID
$secret = "your_app_secret";  // 公众号的AppSecret

$access_token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$secret";

$response = file_get_contents($access_token_url);
$result = json_decode($response, true);

$access_token = $result['access_token'];

$qrcode_url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=$access_token";

// 后续操作...
?>

In the above code, $appid and $secret are the AppID of the official account respectively. and AppSecret. Obtain the access_token by calling the WeChat public platform interface https://api.weixin.qq.com/cgi-bin/token, and then use https://api.weixin.qq.com The /cgi-bin/qrcode/create interface obtains the QR code generation address.

2. Generate QR code image and save it
   After obtaining the QR code generation address, we can use PHP’s imagecreatefromstring and imagepng functions to Generate a QR code and save it as an image. The following is a code example to generate and save a QR code image:

<?php
// 上述代码...

$qrcode_data = array(
    'expire_seconds' => 604800,  // 二维码有效时间，单位为秒，此处设置为7天
    'action_name' => 'QR_SCENE',
    'action_info' => array(
        'scene' => array(
            'scene_id' => 1234  // 二维码参数，可以根据实际需求进行修改
        )
    )
);

$qrcode_json = json_encode($qrcode_data);

$options = array(
    'http' => array(
        'method' => 'POST',
        'header' => 'Content-Type: application/json',
        'content' => $qrcode_json
    )
);

$context = stream_context_create($options);

$qrcode_response = file_get_contents($qrcode_url, false, $context);
$qrcode_result = json_decode($qrcode_response, true);

$qrcode_ticket = $qrcode_result['ticket'];
$qrcode_url = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=" . urlencode($qrcode_ticket);

$qrcode_image = imagecreatefromstring(file_get_contents($qrcode_url));
imagepng($qrcode_image, 'qrcode.png');  // 将二维码保存为qrcode.png

// 后续操作...
?>

In the above code, we convert the QR code data into a JSON string through the json_encode function, and Use the stream_context_create function to create an HTTP request context. Then, we send an HTTP request by calling the file_get_contents function to obtain the JSON data with the QR code image address. Finally, we use the imagecreatefromstring and imagepng functions to generate and save the QR code image as a local file.

Through the above code examples, we can use PHP to develop the QR code generation function of public accounts, making it easier for users to scan the code and follow the public accounts. Of course, the specific QR code parameters and saving path can be modified according to actual needs.

Summary:

This article introduces how to use PHP to develop the QR code generation function of public accounts and provides specific code examples. Through the above method, we can easily generate follow links with QR code images for public accounts, thereby attracting more users to follow the public account and achieve better interactive effects. Hope this article helps you!

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