用全局变量试试

function http_curl($url,$type='get',$res='json',$arr=''){        //1，初始化curl        $ch = curl_init();        //2,设置 curl的参数        curl_setopt($ch, CURLOPT_URL, $url);        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);        if ($type == 'post') {     ...