php - curl_setopt() CURLOPT_FOLLOWLOCATION 问题与 TCPDF

Question

我已将一个站点移至另一个虚拟主机。当我在本地主机上测试时一切正常，但是当我在线尝试时，我收到以下信息:

curl_setopt() [<a href='function.curl-setopt'>function.curl-setopt</a>]: 
    CURLOPT_FOLLOWLOCATION cannot be activated when safe_mode is enabled or 
    an open_basedir is set

当我尝试使用 TCPDF 生成 PDF 文件时(第 7542 行生成错误)

7534             if ($imsize === FALSE) {
7535                 if (function_exists('curl_init')) {
7536                     // try to get remote file data using cURL
7537                     $cs = curl_init(); // curl session
7538                     curl_setopt($cs, CURLOPT_URL, $file);
7539                     curl_setopt($cs, CURLOPT_BINARYTRANSFER, true);
7540                     curl_setopt($cs, CURLOPT_FAILONERROR, true);
7541                     curl_setopt($cs, CURLOPT_RETURNTRANSFER, true);
7542                     curl_setopt($cs, CURLOPT_FOLLOWLOCATION, true);

我该怎么做才能避免这种情况？

Answer 1

如果托管公司/部门不愿意关闭安全模式，解决方法可能是在 php.net http://php.net/manual/ro/function.curl-setopt.php#71313 上找到的有用片段

function curl_redir_exec($ch)
{
    static $curl_loops = 0;
    static $curl_max_loops = 20;
    if ($curl_loops++ >= $curl_max_loops) {
        $curl_loops = 0;
        return FALSE;
    }
    curl_setopt_array($ch, array(CURLOPT_HEADER => true, CURLOPT_RETURNTRANSFER => true));
    $data = curl_exec($ch);
    list($header, $data) = explode("\n\n", $data, 2);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    if ($http_code == 301 || $http_code == 302) {
        $matches = array();
        preg_match('/Location:(.*?)\n/', $header, $matches);
        $url = @parse_url(trim(array_pop($matches)));
        if (!$url) {  //couldn't process the url to redirect to
            $curl_loops = 0;
            return $data;
        }
        $last_url = parse_url(curl_getinfo($ch, CURLINFO_EFFECTIVE_URL));
        foreach(array('scheme', 'host', 'path') as $component) {
            if (!$url[$component]) {
                $url[$component] = $last_url[$component];
            }
        }
        $new_url = $url['scheme'] . '://' . $url['host'] . $url['path'] 
                 . ($url['query'] ? '?' . $url['query'] : '');
        curl_setopt($ch, CURLOPT_URL, $new_url);
        return curl_redir_exec($ch);
    } else {
        $curl_loops = 0;
        return $data;
    }
}