1、安装easywechat

2、使用

        $path = '/pages/index/index';
        $config = [
            'app_id' => 'wxb5axxxx',
            'secret' => 'XXXX',
            'response_type' => 'array',
            'log' => [
                'level' => 'debug',
                'file' => __DIR__.'/wechat.log',
            ],
        ];

        $app = Factory::miniProgram($config);

        $response = $app->app_code->get($path);

        if ($response instanceof \EasyWeChat\Kernel\Http\StreamResponse) {
            $qr_filename = $response->saveAs('wxmp/mp/', 'mp.png');
        }