PHP使用curl方法post发送json数据

	/**
     * PHP发送Json对象数据
     * @param $url 请求url
     * @param $data 发送的json字符串/数组
     * @return array
     */
    private function json_post($url, $data = NULL)
    {
    
    

        $curl = curl_init();

        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        if(!$data){
    
    
            return 'data is null';
        }
        if(is_array($data))
        {
    
    
            $data = json_encode($data);
        }
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        curl_setopt($curl, CURLOPT_HEADER, 0);
        curl_setopt($curl, CURLOPT_HTTPHEADER,array(
                'Content-Type: application/json; charset=utf-8',
                'Content-Length:' . strlen($data),
                'Cache-Control: no-cache',
                'Pragma: no-cache'
        ));
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $res = curl_exec($curl);
        $errorno = curl_errno($curl);
        if ($errorno) {
    
    
            return $errorno;
        }
        curl_close($curl);
        return $res;

    }