PHP implementation of WeChat applet operation flow chart techniques

With the rapid development of the mobile Internet, WeChat mini programs are becoming more and more popular among users, and PHP, as a powerful programming language, also plays an important role in the development process of mini programs. This article will introduce the techniques of implementing WeChat applet operation flow chart in PHP.

1. Get access_token

In the development process of using WeChat applet, you first need to obtain access_token, which is an important credential for realizing the operation of WeChat applet. The code to obtain access_token in PHP is as follows:

function getAccessToken($appid,$appsecret){
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$appsecret";
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        $arr = json_decode($output, true);
        curl_close($ch);
        if(isset($arr['access_token'])){
            return $arr['access_token'];
        }else{
            return false;
        }
    }

The $appid and $appsecret are assigned when creating the mini program on the WeChat public platform.

2. Send template message

Next, you can use PHP to send the template message, the code is as follows:

function sendTemplateMsg($access_token,$openid,$tem_id,$data,$url='',$miniprogram=''){
        $template = array(
            'touser' => $openid,
            'template_id' => $tem_id,
            'data' => $data
        );
        if(!empty($url)){
            $template['url'] = $url;
        }
        if(!empty($miniprogram)){
            $template['miniprogram'] = $miniprogram;
        }
        $url = "https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=".$access_token;
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($template));
        $output = curl_exec($ch);
        curl_close($ch);
        return json_decode($output, true);
    }

where $access_token is the credential obtained in the previous step , $openid is the openid of the user who wants to send the template message, $tem_id is the applied template message ID, and $data is an array containing the message content.

3. Get user information

PHP can also get user-related information, such as user nickname, avatar, etc. The code is as follows:

function getUserInfo($access_token,$openid){
        $url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=$access_token&openid=$openid&lang=zh_CN";
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        $arr = json_decode($output, true);
        curl_close($ch);
        return $arr;
    }

where $access_token is the certificate obtained in the previous step, and $openid is the user openid to obtain user information.

4. Calling WeChat payment

In the development process of WeChat applet, the steps related to user payment can be implemented using PHP. The code is as follows:

function wxpay($params,$key){
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $params['appid'] = YOUR_APPID;
        $params['mch_id'] = YOUR_MCHID;
        $params['nonce_str'] = md5(uniqid(rand(),true));
        $params['sign_type'] = 'MD5';
        $params['spbill_create_ip'] = $_SERVER['REMOTE_ADDR'];
        $params['notify_url'] = YOUR_NOTIFY_URL;
        $params['trade_type'] = 'JSAPI';
        $params['openid'] = YOUR_OPENID;
        ksort($params);
        $str = "";
        foreach($params as $k=>$v){
            if($v != "" && !is_array($v)){
                $str .= $k . "=" . $v . "&";
            }
        }
        $str .= "key=" . $key;
        $params['sign'] = strtoupper(md5($str));
        $xml = arrayToXml($params);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        $output = curl_exec($ch);
        curl_close($ch);
        $arr = xmlToArray($output);
        return $arr;
    }

where $params is an array containing payment-related information, and $key is the API key set on the WeChat merchant platform.

Summary:

The above is the entire content of the WeChat applet operation process in PHP. Through these techniques, the applet development work can be carried out more smoothly. Of course, in actual operation, you also need to consider factors such as program safety, efficiency, and maintainability, and comprehensively consider and use the solution that best suits you, so that you can complete small program development tasks more efficiently.

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