js combined with php to implement the download function
Server
The step is to set the header file parameters, then read in and output the file. File_get_contents in the following code can be replaced by fread and fclose.
download.php
<?php
$filename = $_GET['filename'];
$path = __DIR__."/file/".$filename;
header( "Content-type: application/octet-stream");
header( "Accept-Ranges: bytes ");
header( "Accept-Length: " .filesize($filename));
header( "Content-Disposition: attachment; filename={$filename}");
echo file_get_contents($filename);Client
In many cases, we download files by clicking directly on the front-end page Download, rather than specifically jumping to the download.php above to download.
So we need to implement refresh-free access to download.php on the front end to download files. It is a good way to achieve this through a hidden iframe. The following is the code:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<a href="javascript:download_file('http://localhost/download.php?filename=\" rel="external nofollow" 测试文件.doc\"')">下载</a>
<script type="text/javascript">
function download_file(url)
{
if (typeof (download_file.iframe) == "undefined")
{
var iframe = document.createElement("iframe");
download_file.iframe = iframe;
document.body.appendChild(download_file.iframe);
}
//alert(download_file.iframe);
download_file.iframe.src = url;
download_file.iframe.style.display = "none";
}
</script>
</body>
</html>file_get_contents is read first and then echoed. You can use the readfile function instead, which is more efficient.
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