如何用PHP强制文件下载
我想要求用户在用PHP访问网页时下载一个文件。 我认为这与file_get_contents ，但不知道如何执行它。
$url = "http://example.com/go.exe";
编辑
下载带有header(location)的文件后，它不会redirect到其他页面。 它只是停止。
阅读关于内置PHP函数readfile的文档
$file_url = 'http://www.myremoteserver.com/file.exe'; header('Content-Type: application/octet-stream'); header("Content-Transfer-Encoding: Binary"); header("Content-disposition: attachment; filename=\"" . basename($file_url) . "\""); readfile($file_url); // do the double-download-dance (dirty but worky)
还要确保根据您的文件应用程序/ zip，应用程序/ pdf等添加适当的内容types – 但只有当你不想触发另存为对话框。
header("Content-Type: application/octet-stream"); header("Content-Transfer-Encoding: Binary"); header("Content-disposition: attachment; filename=\"file.exe\""); echo readfile($url);
是正确的
或更好的一个exe文件types
header("Location: $url");
<?php $file = "http://example.com/go.exe"; header("Content-Description: File Transfer"); header("Content-Type: application/octet-stream"); header("Content-Disposition: attachment; filename='" . basename($file) . "'"); readfile ($file); exit(); ?>
或者，当文件不能用浏览器打开时，您可以使用Location标题：
<?php header("Location: http://example.com/go.exe"); ?>
如果你不得不下载大小超过允许的内存限制（ memory_limit ini设置）的文件，这将导致PHP Fatal error: Allowed memory size of 5242880 bytes exhausted错误，你可以这样做：
// File to download. $file = '/path/to/file'; // Maximum size of chunks (in bytes). $maxRead = 1 * 1024 * 1024; // 1MB // Give a nice name to your download. $fileName = 'download_file.txt'; // Open a file in read mode. $fh = fopen($file, 'r'); // These headers will force download on browser, // and set the custom file name for the download, respectively. header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="' . $fileName . '"'); // Run this until we have read the whole file. // feof (eof means "end of file") returns `true` when the handler // has reached the end of file. while (!feof($fh)) { // Read and output the next chunk. echo fread($fh, $maxRead); // Flush the output buffer to free memory. ob_flush(); } // Exit to make sure not to output anything else. exit;
首先显示你的文件，并将其值设置为url。
的index.php
<a href="download.php?download='.$row['file'].'" title="Download File">
的download.php
<?php /*db connectors*/ include('dbconfig.php'); /*function to set your files*/ function output_file($file, $name, $mime_type='') { if(!is_readable($file)) die('File not found or inaccessible!'); $size = filesize($file); $name = rawurldecode($name); $known_mime_types=array( "htm" => "text/html", "exe" => "application/octet-stream", "zip" => "application/zip", "doc" => "application/msword", "jpg" => "image/jpg", "php" => "text/plain", "xls" => "application/vnd.ms-excel", "ppt" => "application/vnd.ms-powerpoint", "gif" => "image/gif", "pdf" => "application/pdf", "txt" => "text/plain", "html"=> "text/html", "png" => "image/png", "jpeg"=> "image/jpg" ); if($mime_type==''){ $file_extension = strtolower(substr(strrchr($file,"."),1)); if(array_key_exists($file_extension, $known_mime_types)){ $mime_type=$known_mime_types[$file_extension]; } else { $mime_type="application/force-download"; }; }; @ob_end_clean(); if(ini_get('zlib.output_compression')) ini_set('zlib.output_compression', 'Off'); header('Content-Type: ' . $mime_type); header('Content-Disposition: attachment; filename="'.$name.'"'); header("Content-Transfer-Encoding: binary"); header('Accept-Ranges: bytes'); if(isset($_SERVER['HTTP_RANGE'])) { list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2); list($range) = explode(",",$range,2); list($range, $range_end) = explode("-", $range); $range=intval($range); if(!$range_end) { $range_end=$size-1; } else { $range_end=intval($range_end); } $new_length = $range_end-$range+1; header("HTTP/1.1 206 Partial Content"); header("Content-Length: $new_length"); header("Content-Range: bytes $range-$range_end/$size"); } else { $new_length=$size; header("Content-Length: ".$size); } $chunksize = 1*(1024*1024); $bytes_send = 0; if ($file = fopen($file, 'r')) { if(isset($_SERVER['HTTP_RANGE'])) fseek($file, $range); while(!feof($file) && (!connection_aborted()) && ($bytes_send<$new_length) ) { $buffer = fread($file, $chunksize); echo($buffer); flush(); $bytes_send += strlen($buffer); } fclose($file); } else die('Error - can not open file.'); die(); } set_time_limit(0); /*set your folder*/ $file_path='uploads/'."your file"; /*output must be folder/yourfile*/ output_file($file_path, ''."your file".'', $row['type']); /*back to index.php while downloading*/ header('Location:index.php'); ?>
上面接受的答案的修改，它也在运行时检测MIMEtypes：
$finfo = finfo_open(FILEINFO_MIME_TYPE); header('Content-Type: '.finfo_file($finfo, $path)); $finfo = finfo_open(FILEINFO_MIME_ENCODING); header('Content-Transfer-Encoding: '.finfo_file($finfo, $path)); header('Content-disposition: attachment; filename="'.basename($path).'"'); readfile($path); // do the double-download-dance (dirty but worky)
以下代码是在php中实现下载服务的正确方法，如以下教程中所述
header('Content-Type: application/zip'); header("Content-Disposition: attachment; filename=\"$file_name\""); set_time_limit(0); $file = @fopen($filePath, "rb"); while(!feof($file)) { print(@fread($file, 1024*8)); ob_flush(); flush(); }
尝试这个：
header('Content-type: audio/mp3'); header('Content-disposition: attachment; filename=“'.$trackname'”'); readfile('folder name /'.$trackname); exit();
http://php.net/manual/en/function.readfile.php
这就是你所需要的。 “Monkey.gif”更改为您的文件名称。 如果您需要从其他服务器下载，“monkey.gif”将更改为“ http://www.exsample.com/go.exe ”
