php 文件下载代码

1.对于一般

$file = "/tmp/dummy.tar.gz";
header("Content-type: application/octet-stream");
header('Content-Disposition: attachment; filename="' . basename($file) . '"');
header("Content-Length: ". filesize($file));
readfile($file);

2.对于下载的文件的名称是中文的，用户下载后肯能出现乱码

$file = "/tmp/中文名.tar.gz";

$filename = basename($file);

header("Content-type: application/octet-stream");

//处理中文文件名
$ua = $_SERVER["HTTP_USER_AGENT"];
$encoded_filename = rawurlencode($filename);
if (preg_match("/MSIE/", $ua)) {
 header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
} else if (preg_match("/Firefox/", $ua)) {
 header("Content-Disposition: attachment; filename*=\"utf8''" . $filename . '"');
} else {
 header('Content-Disposition: attachment; filename="' . $filename . '"');
}

header("Content-Length: ". filesize($file));
readfile($file);

3.我们可以不用readfile,换用其他的也行。

$file = "/tmp/中文名.tar.gz";

$filename = basename($file);

header("Content-type: application/octet-stream");

//处理中文文件名
$ua = $_SERVER["HTTP_USER_AGENT"];
$encoded_filename = rawurlencode($filename);
if (preg_match("/MSIE/", $ua)) {
 header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
} else if (preg_match("/Firefox/", $ua)) {
 header("Content-Disposition: attachment; filename*=\"utf8''" . $filename . '"');
} else {
 header('Content-Disposition: attachment; filename="' . $filename . '"');
}

//让Xsendfile发送文件
header("X-Sendfile: $file");