php获取小程序码

/**
     * [ 获取小程序码]
     * @author [cy] [867235241@qq.com]
     */
	public function getwxaqrcode($id)
    {
       $access_token = $this->AccessToken();
        $url = 'https://api.weixin.qq.com/wxa/getwxacode?access_token='.$access_token;
        $path="pages/index/index?query=".$id;
        $width=430;
        $data='{"path":"'.$path.'","width":'.$width.'}';
        $return = $this->request_post($url,$data);
        //将生成的小程序码存入相应文件夹下
		
		file_put_contents('.http://img.558idc.com/uploadfile/img/'.time().'.jpg',$return);
		$lu = 'http://img.558idc.com/uploadfile/img/'.time().'.jpg';
        $res=db('shop')->where('id',$id)->setField('pay_code',$lu);
		if($res){
		    $this->success('生成成功', 'Shop/index'); 
		}else{
		$this->error('生成失败');  
		}
    }
    public function AccessToken()
    {
	$tokenUrl='https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=&secret=';
    $getArr=array();
    $tokenArr=json_decode($this->send_post($tokenUrl,$getArr,"GET"));
    $access_token=$tokenArr->access_token;
	  return $access_token;

    }
    public function request_post($url, $data){
	
            $ch = curl_init();
            $header=array();
            $header[]='Content-Type: application/json; charset=utf-8';
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
           
            curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
            curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            $tmpInfo = curl_exec($ch);
			
            if (curl_errno($ch)) {
                return false;
            }else{
                return $tmpInfo;
            }
        }
    
function send_post($url, $post_data,$method='POST') {
    $postdata = http_build_query($post_data);
    $options = array(
      'http' => array(
        'method' => $method, //or GET
        'header' => 'Content-type:application/x-www-form-urlencoded',
        'content' => $postdata,
        'timeout' => 15 * 60 // 超时时间（单位:s）
      )
    );
    $context = stream_context_create($options);
    $result = file_get_contents($url, false, $context);
    return $result;
  }