Example of generating WeChat QR code with PHP

You can obtain the QR code of any page of the mini program through the backend interface. Scan the QR code to directly enter the corresponding page of the mini program. It is officially recommended to generate and use small program code, which has better recognition. There are currently 3 interfaces that can generate small program codes, and developers can choose the appropriate interface according to their own needs.

Interface A: Suitable for business scenarios that require a small number of codes. Interface address:

https://api.weixin.qq.com/wxa/getwxacode?access_token=ACCESS_TOKEN

The parameters are as follows:

Note: The small program code generated through this interface is permanently valid. The quantity limit is explained at the end of the article. Please use it with caution. After the user scans the code and enters the mini program, he or she will directly enter the page corresponding to path.

Interface B: Suitable for business scenarios that require a large number of codes or are only used temporarily:

https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=ACCESS_TOKEN

The parameters are as follows:

Note: The small program code generated through this interface is permanently valid and the quantity is not limited at the moment. After the user scans the code and enters the mini program, the developer needs to obtain the value of the scene field in the code on the corresponding page and then perform processing logic. Use the following code to get the value of the scene field in the QR code. During the debugging phase, you can use the conditional compilation of custom parameters scene=xxxx of the development tool for simulation. The parameter value of the scene during the simulation of the development tool needs to be urlencode

// 这是首页的 js
Page({
  onLoad: function(options) {
    // options 中的 scene 需要使用 decodeURIComponent 才能获取到生成二维码时传入的 scene
    var scene = decodeURIComponent(options.scene)
  }
})

Interface C: Applicable For business scenarios that require a small number of codes:

https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=ACCESS_TOKEN

The parameters are as follows:

Note: The mini program QR code generated through this interface is permanent Valid, quantity limit is stated at the end of the article, please use with caution. After the user scans the code and enters the mini program, he or she will directly enter the page corresponding to path.

The POST parameters of these interfaces need to be converted into json strings, and form submission is not supported. The total number of codes generated by interface A plus interface C is limited to 100,000, please call with caution. Taking interface B as an example, let’s talk about generating a QR code image and saving it on the local server:
1. Obtain access_token
access_token is the globally unique interface calling credential. Development The access_token must be used when calling each interface and must be properly stored. I have done WeChat development and public account development, which are the most basic. The method of obtaining access_token here is exactly the same as the public account obtaining access_token. For the method, see: Get the WeChat basic interface credential Access_token

2. Generate QR code

/**
 * 生成小程序二维码
 * @param  string $qr_path 		存储路径,相对于程序根目录(例如:/Public/Qrcode/)
 * @param  string $filename 	存储的图片名称(例如:aaa.png)
 * @param  string $scene 		二维码场景值
 * @param  string $page 		二维码跳转页面
 * @param  string $expires_in 	二维码有效时间
 * @return [type]         [description]
 */
function create_qrcode($qr_path,$filename,$scene,$page='',$expires_in=7200){
	
	if(empty($qr_path)) return array('status'=>0,'info'=>'缺少存储路径'); 
	if(empty($filename)) return array('status'=>0,'info'=>'请确定存储的图片名称'); 
	if(empty($scene)) return array('status'=>0,'info'=>'缺少二维码场景值'); 
	
	if(!is_dir('.'.$qr_path)){								//	./Public/Qrcode/
		mkdir(iconv("GBK","UTF-8",'.'.$qr_path),0777,true); 
	}
	$file = $qr_path.$filename;								//	 /Public/Qrcode/aaa.png
	$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
	$fileUrl = $protocol.$_SERVER['HTTP_HOST'].$file;		//	 http://yourhost/Public/Qrcode/aaa.png
	$savePath = '.'.$file;									//	 ./Public/Qrcode/aaa.png
	if(file_exists($savePath)){
		//当前时间-文件创建时间<过期时间
		if( (time()-filemtime($savePath)) < $expires_in ) return array(&#39;status&#39;=>1,&#39;info&#39;=>$fileUrl); 
	}
	
	$accessToken = &#39;xxxxxxxxxxxxxxxxxxxxxx&#39;; 				// 获取到的 access_token
	$url = &#39;https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=&#39;.$accessToken;
	$qrcode = array(
		&#39;scene&#39;			=> $scene,
		&#39;width&#39;			=> 200,
		&#39;page&#39;			=> $page,
		&#39;auto_color&#39;	=> true
	);
	$result = request($url,true,&#39;POST&#39;,json_encode($qrcode));
	$errcode = json_decode($result,true)[&#39;errcode&#39;];
	$errmsg = json_decode($result,true)[&#39;errmsg&#39;];
	if($errcode) return array(&#39;status&#39;=>0,&#39;info&#39;=>$errmsg); 
	$res = file_put_contents($savePath,$result);			//	将获取到的二维码图片流保存成图片文件

	if($res===false) return array(&#39;status&#39;=>0,&#39;info&#39;=>&#39;生成二维码失败&#39;); 
	return array(&#39;status&#39;=>1,&#39;info&#39;=>$fileUrl); 			//返回本地图片地址
}

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