curl获取不到access_token 查询curl错误                     

private function httpGet($url) {        $curl = curl_init();        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);        curl_setopt($curl, CURLOPT_TIMEOUT, 500);        // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。        // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);//跳过证书验证      //curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true);        curl_setopt($curl, CURLOPT_URL, $url);        $res = curl_exec($curl);        if(curl_error($curl )){             echo curl_error($curl );        }         curl_close($curl);        return $res;}

//参数1：访问的URL，参数2：post数据(不填则为GET)，参数3：提交的$cookies,参数4：是否返回$cookies function curl_request($url,$post='',$cookie='', $returnCookie=0){        $curl = curl_init();        curl_setopt($curl, CURLOPT_URL, $url);        curl_setopt($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)');        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);        curl_setopt($curl, CURLOPT_AUTOREFERER, 1);        curl_setopt($curl, CURLOPT_REFERER, "http://XXX");        if($post) {            curl_setopt($curl, CURLOPT_POST, 1);            curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($post));        }        if($cookie) {            curl_setopt($curl, CURLOPT_COOKIE, $cookie);        }        curl_setopt($curl, CURLOPT_HEADER, $returnCookie);        curl_setopt($curl, CURLOPT_TIMEOUT, 10);        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);        $data = curl_exec($curl);        if (curl_errno($curl)) {            return curl_error($curl);        }        curl_close($curl);        if($returnCookie){            list($header, $body) = explode("\r\n\r\n", $data, 2);            preg_match_all("/Set\-Cookie:([^;]*);/", $header, $matches);            $info['cookie']  = substr($matches[1][0], 1);            $info['content'] = $body;            return $info;        }else{            return $data;        }}