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How to Force File Downloads in PHP Without Redirecting to the Browser?
Generating Download Links in PHP
Introduction
Providing users with the ability to download files is a common feature in web applications. This article will guide you through creating download links for images and preventing navigation to the browser.
Solution
To force a file download, you can utilize the following code:
<code class="php"><?php
// File path on disk
$filePath = '/path/to/file/on/disk.jpg';
// Check if file exists
if(file_exists($filePath)) {
$fileName = basename($filePath);
$fileSize = filesize($filePath);
// Output headers
header("Cache-Control: private");
header("Content-Type: application/stream");
header("Content-Length: ".$fileSize);
header("Content-Disposition: attachment; filename=".$fileName);
// Output file
readfile ($filePath);
exit();
} else {
die('Invalid file path');
}
?></code>
By using this code snippet at the beginning of a PHP page, users will be able to download a file by clicking a normal link.
Security Considerations
When creating a function for downloading arbitrary files, it's crucial to safeguard against malicious input. Employ measures such as realpath to prevent directory traversal and restrict downloads to predetermined locations to maintain website security.
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