Implement WeChat QR code generation in PHP

With the development and popularization of mobile Internet, WeChat has become an indispensable part of people's life and work. In order to meet the needs of users, WeChat continues to launch new functions, the most important of which is WeChat payment. In order to use WeChat payment, you must have a reliable QR code generation function. This article will introduce how to generate WeChat QR code in PHP.

First of all, we need to make it clear that there are two ways to generate WeChat QR codes, one is a permanent QR code, and the other is a temporary QR code. The permanent QR code will only become invalid when the user actively performs an operation. For example, if a permanent QR code is displayed on a certain page in the mall, the QR code will become invalid only when the user scans the QR code and makes a purchase. The temporary QR code will expire within a certain period of time, usually 30 minutes.

Next, we will explain how to generate permanent QR codes and temporary QR codes in PHP.

1. Generation of permanent QR code

To generate permanent QR code, you need to call the QR code interface in WeChat payment. The following is how to call the QR code interface:

//引入Vendor下的自动加载文件
require_once("Vendor/autoload.php");

//设置appid、secret、商户号等信息
$appid = '';  //微信开放平台appid
$appsecret = ''; //微信开放平台appsecret
$merchant_id = '';  //商户号
$key = '';  //API密钥

//构造二维码接口调用参数
$api_url = 'https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=ACCESS_TOKEN';
$access_token = '';  //access_token需要通过调用微信开放平台的token接口获取
$expire_seconds = '';  //永久性二维码不需要该参数
$action_info = ['scene'=>['scene_id'=>1001]];  //永久性二维码的参数形式

//获取access_token
function getAccessToken()
{
    $appid = '';  //微信开放平台appid
    $appsecret = ''; //微信开放平台appsecret
    $api_url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' . $appid . '&secret=' . $appsecret;
    $api_result = file_get_contents($api_url);
    $api_result_arr = json_decode($api_result, true);
    return $api_result_arr['access_token'];
}

$access_token = getAccessToken();

//构造请求参数
$data = array(
    'expire_seconds' => $expire_seconds,
    'action_name' => 'QR_LIMIT_SCENE',
    'action_info' => $action_info
);

$json_data = json_encode($data);

//构造请求头
$header = array(
    'Content-Type: application/json;charset=utf-8',
    'Content-Length: ' . strlen($json_data)
);

//发送POST请求
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, str_replace('ACCESS_TOKEN', $access_token, $api_url));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
$response = curl_exec($ch);
curl_close($ch);

//对响应数据进行处理
$json_obj = json_decode($response, true);
$ticket = $json_obj['ticket'];
$qrcode_url = 'https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=' . urlencode($ticket);

2. Generation of temporary QR code

The generation of temporary QR code also needs to call the QR code interface in WeChat payment, and expire_seconds needs to be specified in the interface call parameter. parameter. The following is how to call the temporary QR code interface:

//引入Vendor下的自动加载文件
require_once("Vendor/autoload.php");

//设置appid、secret、商户号等信息
$appid = '';  //微信开放平台appid
$appsecret = ''; //微信开放平台appsecret
$merchant_id = '';  //商户号
$key = '';  //API密钥

//构造二维码接口调用参数
$api_url = 'https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=ACCESS_TOKEN';
$access_token = '';  //access_token需要通过调用微信开放平台的token接口获取
$expire_seconds = 1800;  //临时性二维码的有效时间为30分钟
$action_info = ['scene'=>['scene_id'=>1001]];  //临时性二维码的参数形式

//获取access_token
function getAccessToken()
{
    $appid = '';  //微信开放平台appid
    $appsecret = ''; //微信开放平台appsecret
    $api_url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' . $appid . '&secret=' . $appsecret;
    $api_result = file_get_contents($api_url);
    $api_result_arr = json_decode($api_result, true);
    return $api_result_arr['access_token'];
}

$access_token = getAccessToken();

//构造请求参数
$data = array(
    'expire_seconds' => $expire_seconds,
    'action_name' => 'QR_SCENE',
    'action_info' => $action_info
);

$json_data = json_encode($data);

//构造请求头
$header = array(
    'Content-Type: application/json;charset=utf-8',
    'Content-Length: ' . strlen($json_data)
);

//发送POST请求
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, str_replace('ACCESS_TOKEN', $access_token, $api_url));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
$response = curl_exec($ch);
curl_close($ch);

//对响应数据进行处理
$json_obj = json_decode($response, true);
$ticket = $json_obj['ticket'];
$qrcode_url = 'https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=' . urlencode($ticket);

The above is the method to generate WeChat QR code in PHP. It should be noted that in actual development, we also need to generate the WeChat QR code in the merchant platform. Public account payment information is generated, and relevant signature verification and security processing are required to ensure the safety and reliability of the QR code.

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