相关疑难解决方法(0)

我尝试用正确的APP_ID,APP_SECRET等发送curl请求到

  https://oauth.vk.com/access_token?client_id=APP_ID&client_secret=APP_SECRET&code=7a6fa4dff77a228eeda56603b8f53806c883f011c40b72630bb50df056f6479e52a&redirect_uri=REDIRECT_URI 

我需要从它获取access_token,但得到一个FALSE并curl_error()打印下一条消息,否则:

60: SSL certificate problem: self signed certificate in certificate chain

我的代码是:

    // create curl resource
    $ch = curl_init();

    // set url
    curl_setopt($ch, CURLOPT_URL, $url);
    //return the transfer as a string
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    // $output contains the output string
    $output = curl_exec($ch);
    if ( ! $output) {
        print curl_errno($ch) .': '. curl_error($ch);
    }

    // close curl resource to free up system resources
    curl_close($ch);

    return $output;

当我手动移动到上面的链接时,我得到了access_token.为什么它不适用于卷曲？请帮忙.