如何使用PHP强制下载文件
如何使用PHP强制下载文件
提问于 2011-09-01 05:53:26
我想要求一个文件被下载后，用户访问与PHP的网页。我认为它与file_get_contents有关，但不确定如何执行它。
$url = "http://example.com/go.exe";使用header(location)下载文件后，它不会重定向到另一个页面。它就会停下来。
回答 10
Stack Overflow用户
发布于 2011-09-01 05:54:41
阅读有关内置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); 还要确保根据您的文件应用程序/zip、应用程序/pdf等添加适当的内容类型-但前提是您不想触发另存为对话框。
Stack Overflow用户
发布于 2011-09-01 05:54:43
<?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 ($file);
exit();
?>或者，当文件无法使用浏览器打开时，您可以只使用Location头文件：
<?php header("Location: http://example.com/go.exe"); ?>Stack Overflow用户
发布于 2015-10-01 18:51:02
首先显示您的文件，并将其值设置为url。
index.php
<a href="download.php?download='.$row['file'].'" title="Download File">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');
?>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/7263923
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