使用 url var 下载文件 Curl

我想用 Curl 下载文件。 问题是下载链接不是直接的，例如：

http://localhost/download.php?id=13456

当我尝试使用curl下载文件时，它下载文件download.php！

这是我的卷曲代码：

        ###
        function DownloadTorrent($a) {
                    $save_to = $this->torrentfolder; // Set torrent folder for download
                    $filename = str_replace('.torrent', '.stf', basename($a));

                    $fp = fopen ($this->torrentfolder.strtolower($filename), 'w+');//This is the file where we save the information
                    $ch = curl_init($a);//Here is the file we are downloading
                    curl_setopt($ch, CURLOPT_ENCODING, "gzip"); // Important 
                    curl_setopt($ch, CURLOPT_TIMEOUT, 50);
                    curl_setopt($ch, CURLOPT_URL, $fp);
                    curl_setopt($ch, CURLOPT_HEADER,0); // None header
                    curl_setopt($ch, CURLOPT_BINARYTRANSFER,1); // Binary trasfer 1
                    curl_exec($ch);
                    curl_close($ch);
                    fclose($fp); 
    }

有没有办法在不知道路径的情况下下载文件？

您可以尝试 CURLOPT_FOLLOWLOCATION

TRUE 表示遵循服务器作为一部分发送的任何“Location:”标头 HTTP 标头（注意这是递归的，PHP 将遵循尽可能多的 发送的“Location:”标头，除非 CURLOPT_MAXREDIRS 为 放）。

所以它会导致：

function DownloadTorrent($a) {
    $save_to = $this->torrentfolder; // Set torrent folder for download
    $filename = str_replace('.torrent', '.stf', basename($a));

    $fp = fopen ($this->torrentfolder.strtolower($filename), 'w+');//This is the file where we save the information
    $ch = curl_init($a);//Here is the file we are downloading
    curl_setopt($ch, CURLOPT_ENCODING, "gzip"); // Important 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 50);
    curl_setopt($ch, CURLOPT_FILE, $fp);
    curl_setopt($ch, CURLOPT_HEADER,0); // None header
    curl_setopt($ch, CURLOPT_BINARYTRANSFER,1); // Binary transfer 1
    curl_exec($ch);
    curl_close($ch);
    fclose($fp); 
}