我如何在脸书群组上运行CURL而不出现错误:“；SSL证书问题q:无法获得本地颁发者证书“；

我正试图为Facebook群组构建一个爬网程序，当运行它来获取页面内容时，我发现了一个问题：

<?php
    $url = "https://www.facebook.com/groups/theGroupId/";
    $ch = curl_init($url);                              // initialize the CURL library in my PHP script so we can later work on it - inside the handler. 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);     // curl_setopt() function is used to set options on the $ch handler.// in this case we use the CURLOPT_RETURNTRANSFER option
    $curl_scraped_page = curl_exec($ch);                //  "run all the stuff we've set" - return the data scraped to the variable $curl_scraped_page
    var_dump($curl_scraped_page);
    if ($curl_scraped_page === false) {
        die(curl_error($ch));
    }
    curl_close($ch);
    echo $curl_scraped_page;
?>

我收到以下错误："SSL证书问题q：无法获取本地颁发者证书"。

我浏览了本教程：http://unitstep.net/blog/2009/05/05/using-curl-in-php-to-access-https-ssltls-protected-sites/这解释了为什么会发生这种情况，以及如何用两种不同的方法解决它，我尝试了两种方法，但仍然得到了相同的错误消息：

<?php
    $url = "https://www.facebook.com/groups/{theGroupId}/";
    $ch = curl_init($url);                              // initialize the CURL library in my PHP script so we can later work on it - inside the handler. 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);     // curl_setopt() function is used to set options on the $ch handler.// in this case we use the CURLOPT_RETURNTRANSFER option
    //curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($ch, CURLOPT_CAINFO, getcwd() . "/CAcerts/GTECyberTrustGlobalRoot.crt");

    $curl_scraped_page = curl_exec($ch);                //  "run all the stuff we've set" - return the data scraped to the variable $curl_scraped_page
    var_dump($curl_scraped_page);
    if ($curl_scraped_page === false) {
        die(curl_error($ch));
    }

    curl_close($ch);

    echo $curl_scraped_page;
?>

这是确切的输出（使用var_dump）：

boolean false
SSL certificate problem: unable to get local issuer certificate

我做错什么了吗？这是正确的方法吗？