使用 php 下载文件，不能处理大文件？ [复制]答案

【问题标题】：using php to download files, not working on large files? [duplicate]使用 php 下载文件，不能处理大文件？ [复制]
【发布时间】：2011-03-11 18:06:52
【问题描述】：

我正在使用 php 下载文件，而不是文件本身在新窗口中打开。它似乎适用于较小的文件，但不适用于大文件（我需要它来处理非常大的文件）。这是我必须下载文件的代码：

function downloadFile($file) {   
    if (file_exists($file)) {         
        //download file
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename='.basename($file));
        header('Content-Transfer-Encoding: binary');
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        header('Content-Length: '.filesize($file));
        ob_clean();
        flush();
        readfile($file);
        exit;   
    };    
};

但是当我尝试下载一个大文件（例如 265mb）时，浏览器告诉我它找不到该文件？这些文件肯定在服务器上，并且该脚本适用于较小的文件。有什么方法可以下载类似于我已有的大文件吗？

【问题讨论】：

标签： php download large-files

【解决方案1】：

此下载脚本能够下载非常大的文件（MB 或 GB）。还要确保按照 tomit 所述设置 ini 设置。对于大型文件，通常最好在 PHP 中使用 X-Sendfile 方法。 Learn more here。无论如何，我发布了工作代码。也许它对寻找无错误、工作脚本的人很有用。脚本采用from PHPsnips，希望对您有用。

/**  
* @author     Jack Mason  
* @website    volunteer @ http://www.osipage.com, web access application and bookmarking tool.    
* @copyright Free script, use anywhere as you like, no attribution required 
*/ 

/* You may need these ini settings too */ 
set_time_limit(0); 
ini_set('memory_limit', '512M');

//THE DOWNLOAD SCRIPT 
$filePath = "D:/Software/versions/windows/windows_7.rar"; // set your download file path here. 
download($filePath); // calls download function 
function download($filePath) 
{     
    if(!empty($filePath)) 
    { 
        $fileInfo = pathinfo($filePath); 
        $fileName  = $fileInfo['basename']; 
        $fileExtnesion   = $fileInfo['extension']; 
        $default_contentType = "application/octet-stream"; 
        $content_types_list = mimeTypes(); 
        // to find and use specific content type, check out this IANA page : http://www.iana.org/assignments/media-types/media-types.xhtml 
        if (array_key_exists($fileExtnesion, $content_types_list))  
        { 
            $contentType = $content_types_list[$fileExtnesion]; 
        } 
        else 
        { 
            $contentType =  $default_contentType; 
        } 
        if(file_exists($filePath)) 
        { 
            $size = filesize($filePath); 
            $offset = 0; 
            $length = $size; 
            //HEADERS FOR PARTIAL DOWNLOAD FACILITY BEGINS 
            if(isset($_SERVER['HTTP_RANGE'])) 
            { 
                preg_match('/bytes=(\d+)-(\d+)?/', $_SERVER['HTTP_RANGE'], $matches); 
                $offset = intval($matches[1]); 
                $length = intval($matches[2]) - $offset; 
                $fhandle = fopen($filePath, 'r'); 
                fseek($fhandle, $offset); // seek to the requested offset, this is 0 if it's not a partial content request 
                $data = fread($fhandle, $length); 
                fclose($fhandle); 
                header('HTTP/1.1 206 Partial Content'); 
                header('Content-Range: bytes ' . $offset . '-' . ($offset + $length) . '/' . $size); 
            }//HEADERS FOR PARTIAL DOWNLOAD FACILITY BEGINS 
            //USUAL HEADERS FOR DOWNLOAD 
            header("Content-Disposition: attachment;filename=".$fileName); 
            header('Content-Type: '.$contentType); 
            header("Accept-Ranges: bytes"); 
            header("Pragma: public"); 
            header("Expires: -1"); 
            header("Cache-Control: no-cache"); 
            header("Cache-Control: public, must-revalidate, post-check=0, pre-check=0"); 
            header("Content-Length: ".filesize($filePath)); 
            $chunksize = 8 * (1024 * 1024); //8MB (highest possible fread length) 
            if ($size > $chunksize) 
            { 
              $handle = fopen($_FILES["file"]["tmp_name"], 'rb'); 
              $buffer = ''; 
              while (!feof($handle) && (connection_status() === CONNECTION_NORMAL))  
              { 
                $buffer = fread($handle, $chunksize); 
                print $buffer; 
                ob_flush(); 
                flush(); 
              } 
              if(connection_status() !== CONNECTION_NORMAL) 
              { 
                echo "Connection aborted"; 
              } 
              fclose($handle); 
            } 
            else  
            { 
              ob_clean(); 
              flush(); 
              readfile($filePath); 
            } 
         } 
         else 
         { 
           echo 'File does not exist!'; 
         } 
    } 
    else 
    { 
        echo 'There is no file to download!'; 
    } 
}     


/* Function to get correct MIME type for download */ 
function mimeTypes() 
{ 
/* Just add any required MIME type if you are going to download something not listed here.*/ 
$mime_types = array("323" => "text/h323", 
                    "acx" => "application/internet-property-stream", 
                    "ai" => "application/postscript", 
                    "aif" => "audio/x-aiff", 
                    "aifc" => "audio/x-aiff", 
                    "aiff" => "audio/x-aiff", 
                    "asf" => "video/x-ms-asf", 
                    "asr" => "video/x-ms-asf", 
                    "asx" => "video/x-ms-asf", 
                    "au" => "audio/basic", 
                    "avi" => "video/x-msvideo", 
                    "axs" => "application/olescript", 
                    "bas" => "text/plain", 
                    "bcpio" => "application/x-bcpio", 
                    "bin" => "application/octet-stream", 
                    "bmp" => "image/bmp", 
                    "c" => "text/plain", 
                    "cat" => "application/vnd.ms-pkiseccat", 
                    "cdf" => "application/x-cdf", 
                    "cer" => "application/x-x509-ca-cert", 
                    "class" => "application/octet-stream", 
                    "clp" => "application/x-msclip", 
                    "cmx" => "image/x-cmx", 
                    "cod" => "image/cis-cod", 
                    "cpio" => "application/x-cpio", 
                    "crd" => "application/x-mscardfile", 
                    "crl" => "application/pkix-crl", 
                    "crt" => "application/x-x509-ca-cert", 
                    "csh" => "application/x-csh", 
                    "css" => "text/css", 
                    "dcr" => "application/x-director", 
                    "der" => "application/x-x509-ca-cert", 
                    "dir" => "application/x-director", 
                    "dll" => "application/x-msdownload", 
                    "dms" => "application/octet-stream", 
                    "doc" => "application/msword", 
                    "dot" => "application/msword", 
                    "dvi" => "application/x-dvi", 
                    "dxr" => "application/x-director", 
                    "eps" => "application/postscript", 
                    "etx" => "text/x-setext", 
                    "evy" => "application/envoy", 
                    "exe" => "application/octet-stream", 
                    "fif" => "application/fractals", 
                    "flr" => "x-world/x-vrml", 
                    "gif" => "image/gif", 
                    "gtar" => "application/x-gtar", 
                    "gz" => "application/x-gzip", 
                    "h" => "text/plain", 
                    "hdf" => "application/x-hdf", 
                    "hlp" => "application/winhlp", 
                    "hqx" => "application/mac-binhex40", 
                    "hta" => "application/hta", 
                    "htc" => "text/x-component", 
                    "htm" => "text/html", 
                    "html" => "text/html", 
                    "htt" => "text/webviewhtml", 
                    "ico" => "image/x-icon", 
                    "ief" => "image/ief", 
                    "iii" => "application/x-iphone", 
                    "ins" => "application/x-internet-signup", 
                    "isp" => "application/x-internet-signup", 
                    "jfif" => "image/pipeg", 
                    "jpe" => "image/jpeg", 
                    "jpeg" => "image/jpeg", 
                    "jpg" => "image/jpeg", 
                    "js" => "application/x-javascript", 
                    "latex" => "application/x-latex", 
                    "lha" => "application/octet-stream", 
                    "lsf" => "video/x-la-asf", 
                    "lsx" => "video/x-la-asf", 
                    "lzh" => "application/octet-stream", 
                    "m13" => "application/x-msmediaview", 
                    "m14" => "application/x-msmediaview", 
                    "m3u" => "audio/x-mpegurl", 
                    "man" => "application/x-troff-man", 
                    "mdb" => "application/x-msaccess", 
                    "me" => "application/x-troff-me", 
                    "mht" => "message/rfc822", 
                    "mhtml" => "message/rfc822", 
                    "mid" => "audio/mid", 
                    "mny" => "application/x-msmoney", 
                    "mov" => "video/quicktime", 
                    "movie" => "video/x-sgi-movie", 
                    "mp2" => "video/mpeg", 
                    "mp3" => "audio/mpeg", 
                    "mpa" => "video/mpeg", 
                    "mpe" => "video/mpeg", 
                    "mpeg" => "video/mpeg", 
                    "mpg" => "video/mpeg", 
                    "mpp" => "application/vnd.ms-project", 
                    "mpv2" => "video/mpeg", 
                    "ms" => "application/x-troff-ms", 
                    "mvb" => "application/x-msmediaview", 
                    "nws" => "message/rfc822", 
                    "oda" => "application/oda", 
                    "p10" => "application/pkcs10", 
                    "p12" => "application/x-pkcs12", 
                    "p7b" => "application/x-pkcs7-certificates", 
                    "p7c" => "application/x-pkcs7-mime", 
                    "p7m" => "application/x-pkcs7-mime", 
                    "p7r" => "application/x-pkcs7-certreqresp", 
                    "p7s" => "application/x-pkcs7-signature", 
                    "pbm" => "image/x-portable-bitmap", 
                    "pdf" => "application/pdf", 
                    "pfx" => "application/x-pkcs12", 
                    "pgm" => "image/x-portable-graymap", 
                    "pko" => "application/ynd.ms-pkipko", 
                    "pma" => "application/x-perfmon", 
                    "pmc" => "application/x-perfmon", 
                    "pml" => "application/x-perfmon", 
                    "pmr" => "application/x-perfmon", 
                    "pmw" => "application/x-perfmon", 
                    "pnm" => "image/x-portable-anymap", 
                    "pot" => "application/vnd.ms-powerpoint", 
                    "ppm" => "image/x-portable-pixmap", 
                    "pps" => "application/vnd.ms-powerpoint", 
                    "ppt" => "application/vnd.ms-powerpoint", 
                    "prf" => "application/pics-rules", 
                    "ps" => "application/postscript", 
                    "pub" => "application/x-mspublisher", 
                    "qt" => "video/quicktime", 
                    "ra" => "audio/x-pn-realaudio", 
                    "ram" => "audio/x-pn-realaudio", 
                    "ras" => "image/x-cmu-raster", 
                    "rgb" => "image/x-rgb", 
                    "rmi" => "audio/mid", 
                    "roff" => "application/x-troff", 
                    "rtf" => "application/rtf", 
                    "rtx" => "text/richtext", 
                    "scd" => "application/x-msschedule", 
                    "sct" => "text/scriptlet", 
                    "setpay" => "application/set-payment-initiation", 
                    "setreg" => "application/set-registration-initiation", 
                    "sh" => "application/x-sh", 
                    "shar" => "application/x-shar", 
                    "sit" => "application/x-stuffit", 
                    "snd" => "audio/basic", 
                    "spc" => "application/x-pkcs7-certificates", 
                    "spl" => "application/futuresplash", 
                    "src" => "application/x-wais-source", 
                    "sst" => "application/vnd.ms-pkicertstore", 
                    "stl" => "application/vnd.ms-pkistl", 
                    "stm" => "text/html", 
                    "svg" => "image/svg+xml", 
                    "sv4cpio" => "application/x-sv4cpio", 
                    "sv4crc" => "application/x-sv4crc", 
                    "t" => "application/x-troff", 
                    "tar" => "application/x-tar", 
                    "tcl" => "application/x-tcl", 
                    "tex" => "application/x-tex", 
                    "texi" => "application/x-texinfo", 
                    "texinfo" => "application/x-texinfo", 
                    "tgz" => "application/x-compressed", 
                    "tif" => "image/tiff", 
                    "tiff" => "image/tiff", 
                    "tr" => "application/x-troff", 
                    "trm" => "application/x-msterminal", 
                    "tsv" => "text/tab-separated-values", 
                    "txt" => "text/plain", 
                    "uls" => "text/iuls", 
                    "ustar" => "application/x-ustar", 
                    "vcf" => "text/x-vcard", 
                    "vrml" => "x-world/x-vrml", 
                    "wav" => "audio/x-wav", 
                    "wcm" => "application/vnd.ms-works", 
                    "wdb" => "application/vnd.ms-works", 
                    "wks" => "application/vnd.ms-works", 
                    "wmf" => "application/x-msmetafile", 
                    "wps" => "application/vnd.ms-works", 
                    "wri" => "application/x-mswrite", 
                    "wrl" => "x-world/x-vrml", 
                    "wrz" => "x-world/x-vrml", 
                    "xaf" => "x-world/x-vrml", 
                    "xbm" => "image/x-xbitmap", 
                    "xla" => "application/vnd.ms-excel", 
                    "xlc" => "application/vnd.ms-excel", 
                    "xlm" => "application/vnd.ms-excel", 
                    "xls" => "application/vnd.ms-excel", 
                    "xlt" => "application/vnd.ms-excel", 
                    "xlw" => "application/vnd.ms-excel", 
                    "xof" => "x-world/x-vrml", 
                    "xpm" => "image/x-xpixmap", 
                    "xwd" => "image/x-xwindowdump", 
                    "z" => "application/x-compress", 
                    "rar" => "application/x-rar-compressed", 
                    "zip" => "application/zip"); 
return $mime_types;                     
}
?>

【讨论】：

非常好的解决方案。
对于文件路径，我们应该使用应用程序目录或 os 目录的相对路径。
@Pradeepta 是的，您可以在网络上使用可访问的 URL。例如，$filePath = 'http://example.com/assests/videos/movie.rar'; /*change it as per your requirements. This is more preferrable */ download($filePath); 如果这不起作用。您可以尝试相对路径。两者都应该很好用。
我个人修改了PHP中常用的下载脚本，使其能够下载大文件；我在上面发布的代码能够下载近 2GB 左右的空间。经测试，效果很好。为了让这适用于您的应用程序，您需要在 php.ini 和 Apache Web 服务器配置中进行适当的设置，以允许最长的执行时间。

【解决方案2】：

PHP 对脚本可以运行多长时间以及可以使用多少内存有限制。可能是脚本在完成之前就超时了，或者由于读入大文件而占用了太多内存。

尝试调整php.ini 中的max_execution_time 和memory_limit 变量。如果您无权访问 php.ini，请尝试使用 set_time_limit 和/或 ini_set 函数。

【讨论】：

.."或者读入大文件占用了太多内存。" 是的。 应该将ob_clean_end 与readfile 一起使用，而不是ob_clean。但是，可能仍会达到其他限制。

【解决方案3】：

我看到你正在使用ob_clean。如果您启用了输出缓冲，请尝试禁用它（例如，将 ob_clean 调用替换为 ob_end_clean）。

【讨论】：

将其更改为 ob_end_clean 但它仍然无法下载大文件。较小的文件仍然可以正常工作。我尝试下载大的 zip 文件有影响吗？跨度>
@Soul 你确定没有错误吗？检查 PHP 错误日志（如果有），或者，如果打开了 display_errors，请注释掉所有 header 调用并重试。