PHP cURL 通过浏览器下载文件

Question

我创建脚本从某个文件服务器下载文件，但不能正常工作。

        function downloadPage2($url){

        $ch = curl_init();
        $userAgent = 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)';
        curl_setopt($ch, CURLOPT_USERAGENT, $userAgent);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_VERBOSE, 1);
        curl_setopt($ch, CURLOPT_AUTOREFERER, false);   
        curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
        curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie.txt');
        curl_setopt($ch, CURLOPT_HEADER, 1);
        curl_setopt($ch, CURLOPT_BUFFERSIZE, 8096);
        curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
        curl_setopt($ch, CURLOPT_WRITEFUNCTION, function($ch, $buffer) {

            header('Expires: 0'); // no cache
            header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
            header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
            header('Cache-Control: private', false);
            header('Content-Type: application/force-download');
            header('Content-Disposition: attachment; filename="mp3.mp3"');
            header('Content-Transfer-Encoding: binary');
//          header('Content-Length: ' . strlen($buffer)); // provide file size
            header('Connection: close');
            echo $buffer;
              return strlen($buffer);
            });
        curl_exec ($ch);
        curl_close($ch);
    }

当从服务器输入 $url 到文件 (mp3) 时，它会下载这个文件，但不是正确的文件大小。示例：服务器上的文件大小为 4.5mb，我的脚本下载了它，但大小为 6mb。音乐正在播放，但每秒中断。 你知道哪里出了问题吗？

我尝试在标题中设置内容长度，但每个函数都返回内容长度 = 0

Answer 1

试试这个，它对我下载大文件有用

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $source);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
// if https
curl_setopt($ch, CURLOPT_SSLVERSION, 3);
// or set this option
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$data = curl_exec($ch);

$error = curl_error($ch);
$file = $data = curl_exec($ch);
curl_close($ch);
if (file_exists($file)) {
  header("Content-Type: audio/mpeg, audio/x-mpeg, audio/x-mpeg-3, audio/mpeg3");
  header('Content-Disposition: attachment; filename="sometrack.mp3"');
  header("Content-Transfer-Encoding: binary");
  header('Content-length: ' . filesize($file));
  header('X-Pad: avoid browser bug');
  header('Cache-Control: no-cache');
  readfile($file);
} else {
  echo "no file";
}

Answer 2

这段代码对我来说很好用，我正在使用 php readfile 函数根据readfile 的文档从远程主机读取文件：

如果 fopen_wrappers 已启用，则 URL 可用作此函数的文件名。有关如何指定文件名的更多详细信息，请参阅 fopen()。请参阅支持的协议和包装器以获取有关各种包装器具有哪些功能的信息的链接、有关它们的使用说明以及它们可能提供的任何预定义变量的信息。

        header('Content-Type:'.$this->get_mime_type($url));
        header("Content-Transfer-Encoding: Binary");
        header("Content-disposition: attachment; filename=".$filename);
        echo readfile($url);


 function get_mime_type($filename) {
    $idx = explode( '.', $filename );
    $count_explode = count($idx);
    $idx = strtolower($idx[$count_explode-1]);

    $mimet = array(
        'txt' => 'text/plain',
        'htm' => 'text/html',
        'html' => 'text/html',
        'php' => 'text/html',
        'css' => 'text/css',
        'js' => 'application/javascript',
        'json' => 'application/json',
        'xml' => 'application/xml',
        'swf' => 'application/x-shockwave-flash',
        'flv' => 'video/x-flv',

        // images
        'png' => 'image/png',
        'jpe' => 'image/jpeg',
        'jpeg' => 'image/jpeg',
        'jpg' => 'image/jpeg',
        'gif' => 'image/gif',
        'bmp' => 'image/bmp',
        'ico' => 'image/vnd.microsoft.icon',
        'tiff' => 'image/tiff',
        'tif' => 'image/tiff',
        'svg' => 'image/svg+xml',
        'svgz' => 'image/svg+xml',

        // archives
        'zip' => 'application/zip',
        'rar' => 'application/x-rar-compressed',
        'exe' => 'application/x-msdownload',
        'msi' => 'application/x-msdownload',
        'cab' => 'application/vnd.ms-cab-compressed',

        // audio/video
        'mp3' => 'audio/mpeg',
        'qt' => 'video/quicktime',
        'mov' => 'video/quicktime',

        // adobe
        'pdf' => 'application/pdf',
        'psd' => 'image/vnd.adobe.photoshop',
        'ai' => 'application/postscript',
        'eps' => 'application/postscript',
        'ps' => 'application/postscript',

        // ms office
        'doc' => 'application/msword',
        'rtf' => 'application/rtf',
        'xls' => 'application/vnd.ms-excel',
        'ppt' => 'application/vnd.ms-powerpoint',
        'docx' => 'application/msword',
        'xlsx' => 'application/vnd.ms-excel',
        'pptx' => 'application/vnd.ms-powerpoint',


        // open office
        'odt' => 'application/vnd.oasis.opendocument.text',
        'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
    );

    if (isset( $mimet[$idx] )) {
        return $mimet[$idx];
    } else {
        return 'application/octet-stream';
    }
}