PHP cURL在localhost中工作但不在Linux Server上工作

Question

我在本地和服务器上运行相同的代码。但是，相同的代码在本地而不是服务器端运行。没有显示错误。

$contents = '';
if (function_exists('curl_init'))
{   // first check with curl as we can set short timeout;
    $retry = 1;
    do {
                $check = _isCurl();
                //  display_error( _("version: " . $check));
        $ch = curl_init();
        curl_setopt ($ch, CURLOPT_URL, 'http://'.$site.$filename);
        curl_setopt ($ch, CURLOPT_COOKIEJAR, "$path_to_root/tmp/cookie.txt");
        curl_setopt ($ch, CURLOPT_HEADER, 0);
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
        // prevent warning while safe_mode/open_basedir on (redireciton doesn't occur at least on ECB page)
        if (!ini_get('safe_mode') && !ini_get('open_basedir'))
            curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt ($ch, CURLOPT_TIMEOUT, 3);
        $contents = curl_exec ($ch);
        curl_close($ch);
        // due to resolver bug in some curl versions (e.g. 7.15.5) 
        // try again for constant IP.
        if (isset($site_ip))
                    {
                       // display_error( _("in " . $site_ip));
            $site=$site_ip;
                    }

   } while( ($contents == '') && $retry--);

我试图运行curl_getinfo（$ ch）;

本地

数组（[url] =＆gt; myURL [content_type] =＆gt; text / xml [http_code] =＆gt; 200 [header_size] =＆gt; 237 [request_size] =＆gt; 91 [filetime] =＆gt; -1 [ssl_verify_result] =＆gt; 0 [redirect_count] =＆gt; 0 [total_time] =＆gt; 0.016 [namelookup_time] =＆gt; 0.016 [connect_time] =＆gt; 0.016 [pretransfer_time] =＆gt; 0.016 [size_upload] =＆gt; 0 [ size_download] =＆gt; 1624 [speed_download] =＆gt; 0 [speed_upload] =＆gt; 0 [download_content_length] =＆gt; 0 [upload_content_length] =＆gt; 0 [starttransfer_time] =＆gt; 0.072781 [redirect_time] =＆gt; 0）< / p>

服务器

数组（[url] =＆gt; myURL [content_type] =＆gt; [http_code] =＆gt; 0 [header_size] =＆gt; 0 [request_size] =＆gt; 0 [filetime] =＆gt; -1 [ssl_verify_result] =＆gt; 0 [redirect_count] =＆gt; 0 [total_time] =＆gt; 3.003278 [namelookup_time] =＆gt; 7.0E- [connect_time] =＆gt; 5 [pretransfer_time] =＆gt; 0 [size_upload] =＆gt; 0 [size_download ] =＆gt; 0 [speed_download] =＆gt; 0 [speed_upload] =＆gt; 0 [download_content_length] =＆gt; 0 [upload_content_length] =＆gt; 0 [starttransfer_time] =＆gt; 0.072781 [redirect_time] =＆gt; 0）