1、composer下載thinkphp5

composer create-project topthink/think [你的目錄名] --prefer-dist

2、composer下載easywechat

composer require hooklife/thinkphp5-wechat

3、配置好小程式的appid和appsercret,還有證書

第一步： 
獲取使用者的openid

小程式程式碼

//app.js  
App({ 
 onLaunch: function() { 
  wx.login({ 
     success: function (res) { 
if (res.code) { 
//發起網路請求獲得openid  
 

         wx.request({ 
           url: 'https://xxxxxxxx/index/on_login/index', 
           data: { 
             code: res.code  
}, 
           success:function(res){ 
//console.log(res.data.openid)  
             that.globalData.openId = res.data.openid  
}, 
           fail:function(e){ 
             console
 
.log(e); 
} 
}) 
} else { 
         console.log('獲取使用者登入態失敗！' + res.errMsg) 
} 
} 
}); 
} 
}) 

php 程式碼

public function index(){ 

       $code = input('code'); 
       $appid = 'xxx'; 
       $appsecret = 'xxxx'; 
//初始化  
       $ch = curl_init(); 
//設定選項，包括URL  
       curl_setopt($ch, CURLOPT_URL, "https://api.weixin.qq.com/sns/jscode2session?appid={$appid}&secret={$appsecret}&js_code={$code}&grant_type=authorization_code"
 
); 
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
       curl_setopt($ch, CURLOPT_HEADER, 0); 
//執行並獲取HTML文件內容  
       $output = curl_exec($ch); 
//釋放curl控制代碼  
       curl_close($ch); 
//列印獲得的資料  
return $output; 
} 

第二步：

發起微信支付

小程式程式碼

payMent:function(e){ 
var that = this; 
   wx.request({ 
     url: 'https://xxx/index/index/index.html', 
     data:{ 
'openid': app.globalData.openId, 
'total_money':1 
}, 
     success:function(res){ 
      wx.requestPayment({ 
'timeStamp': res.data.timeStamp+'', 
'nonceStr': res.data.nonceStr, 
'package': res.data.package, 
'signType': 'MD5', 
'paySign': res.data.paySign, 
'success': function (ref) { 
          console.log(ref); 
          wx.showToast({ 
            title: '支付成功', 
            icon: 'success', 
            duration: 2000 
}) 
}, 
'fail': function (ref) { 
          console.log(ref); 
          wx.showToast({ 
            title: '支付失敗', 
            icon: 'fail', 
            duration: 2000 
}) 
} 
}) 
} 
}) 
}, 

php程式碼

easywechat支付

public function index() 
{ 
       $app = Wechat::app(); 
       $payment = $app->payment; 
       $openid = input('openid'); 
       $total_money = input('total_money/d'); 

       $attributes = [ 
'trade_type' => 'JSAPI', // JSAPI，NATIVE，APP...  
'body' => 'iPad mini 16G 白色', 
'detail' => 'iPad mini 16G 白色', 
'out_trade_no' => time() . rand(1000, 9999), 
'total_fee' => $total_money, // 單位：分  
'notify_url' => 'https://xxx/index/index/order_notify.html', // 支付結果通知網址，如果不設定則會使用配置裡的預設地址  
'openid' => $openid, // trade_type=JSAPI，此引數必傳，使用者在商戶appid下的唯一標識，  
]; 
       $order = new Order($attributes); 
       $result = $payment->prepare($order); 
       $config = array(); 
if ($result->return_code == 'SUCCESS' && $result->result_code == 'SUCCESS'){ 
           $prepayId = $result->prepay_id; 
           $config = $payment->configForJSSDKPayment($prepayId); 
} 
       $arr = array( 
'timeStamp'=>$config['timestamp'], 
'nonceStr'=>$config['nonceStr'], 
'package'=>$config['package'], 
'signType'=>'MD5', 
'paySign'=>$config['paySign'], 
); 
return json_encode($arr); 
} 

public function order_notify(){ 
       $app = Wechat::app(); 

       $response = $app->payment->handleNotify(function($notify, $successful){ 
// 你的邏輯  
return true; // 或者錯誤訊息  
}); 
       $response->send(); 
}