PHP generates QR code for WeChat applet with parameters

This article mainly introduces the QR code generated by PHP for WeChat applet with parameters. It has certain reference value. Now I share it with you. Friends in need can refer to it

The WeChat mini program officially opens three interfaces for creating QR codes, one of which is for generating QR codes, and the other is a sunflower-shaped mini program code. I use PHP to generate QR codes here.

First of all, you need to obtain Access_token

This request is also very easy. The WeChat development documentation has a request interface:
You need to obtain the APPID and APPSECRET of your own mini program

https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET

access_token is only valid for 2 hours, so it is best to cache it to avoid repeated requests

Build request parameters

You can build an array, Then convert it into json data and assign it to a variable

$param = json_encode(array("path"=>"pages/index/index?id=123","width"=> 150));

Then POST the data to the WeChat server in exchange for a QR code

Full code

 $_SESSION['expires_in']))
 {

     $json = httpRequest( $access_token );
     $json = json_decode($json,true); 
     // var_dump($json);
     $_SESSION['access_token'] = $json['access_token'];
     $_SESSION['expires_in'] = time()+7200;
     $ACCESS_TOKEN = $json["access_token"]; 
 } 
 else{

     $ACCESS_TOKEN =  $_SESSION["access_token"]; 
 }

//构建请求二维码参数
//path是扫描二维码跳转的小程序路径，可以带参数?id=xxx
//width是二维码宽度
$qcode ="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=$ACCESS_TOKEN";
$param = json_encode(array("path"=>"pages/index/index?id=123","width"=> 150));

//POST参数
$result = httpRequest( $qcode, $param,"POST");
//生成二维码
file_put_contents("qrcode.png", $result);
$base64_image ="data:image/jpeg;base64,".base64_encode( $result );

//把请求发送到微信服务器换取二维码
  function httpRequest($url, $data='', $method='GET'){
    $curl = curl_init();  
    curl_setopt($curl, CURLOPT_URL, $url);  
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);  
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);  
    curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);  
    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);  
    curl_setopt($curl, CURLOPT_AUTOREFERER, 1);  
    if($method=='POST')
    {
        curl_setopt($curl, CURLOPT_POST, 1); 
        if ($data != '')
        {
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);  
        }
    }

    curl_setopt($curl, CURLOPT_TIMEOUT, 30);  
    curl_setopt($curl, CURLOPT_HEADER, 0);  
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  
    $result = curl_exec($curl);  
    curl_close($curl);  
    return $result;
  } 

?>

Usage method:

1. Create a new qrcode.php
2. Copy the above code into it
3. Modify the APPID and APPSECRET
4. Visit qrcode.php

to generate a small program with parameters 2 QR code

#But this interface generates a small program QR code with a LOGO.
We want to generate a simple QR code for a small program without a logo. Is it okay?
There is no official way, but we can use a third-party interface to generate ordinary QR codes.

Steps to generate QR code without LOGO

1. Decode first, decode the QR code of the mini program just generated, and obtain the URL
2. Use ordinary QR code to obtain the URL The QR code generation interface generates ordinary QR codes without LOGO

1. Decoding

In fact, there are many libraries for decoding. I directly use the third-party JSSDK decoding here. It is free and requires application. The interface and appid and appkey

生成无LOGO二维码
nbsp;html>

  
    
    
    
    
    
    
  
  
    
    

    

        
        

        
    
    点击生成无LOGO二维码
    
  

The above is decoding implemented through js. The decoding still calls an image address of the QR code generated by php

The above is calling a local image, so This decoding program needs to be used in conjunction with the PHP code that generates the QR code for the mini program.

After decoding, a QR code without LOGO needs to be generated. For this, I only need to call an interface.
Interface: http://qr.liantu.com/api.php?...

Then splicing the decoded url can generate a QR code.

Then the combination of generating small program code and generating code without LOGO QR code is:

 $_SESSION['expires_in']))
 {

     $json = httpRequest( $access_token );
     $json = json_decode($json,true); 
     // var_dump($json);
     $_SESSION['access_token'] = $json['access_token'];
     $_SESSION['expires_in'] = time()+7200;
     $ACCESS_TOKEN = $json["access_token"]; 
 } 
 else{

     $ACCESS_TOKEN =  $_SESSION["access_token"]; 
 }

//构建请求二维码参数
//path是扫描二维码跳转的小程序路径，可以带参数?id=xxx
//width是二维码宽度
$qcode ="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=$ACCESS_TOKEN";
$param = json_encode(array("path"=>"pages/index/index?id=123","width"=> 150));

//POST参数
$result = httpRequest( $qcode, $param,"POST");
//生成二维码
file_put_contents("qrcode.png", $result);
$base64_image ="data:image/jpeg;base64,".base64_encode( $result );

//把请求发送到微信服务器换取二维码
  function httpRequest($url, $data='', $method='GET'){
    $curl = curl_init();  
    curl_setopt($curl, CURLOPT_URL, $url);  
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);  
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);  
    curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);  
    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);  
    curl_setopt($curl, CURLOPT_AUTOREFERER, 1);  
    if($method=='POST')
    {
        curl_setopt($curl, CURLOPT_POST, 1); 
        if ($data != '')
        {
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);  
        }
    }

    curl_setopt($curl, CURLOPT_TIMEOUT, 30);  
    curl_setopt($curl, CURLOPT_HEADER, 0);  
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  
    $result = curl_exec($curl);  
    curl_close($curl);  
    return $result;
  } 

?>

生成小程序官方二维码

"/>



生成无LOGO二维码

nbsp;html>

  
    
    
    
    
    
    
  
  
    

    

        
        

        
    
    点击生成无LOGO二维码
    
  

But two js libraries are needed for decoding

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