How can one efficiently display uploaded files on a webpage using PHP and provide unique download links for file sharing while ensuring data integrity?

To efficiently display uploaded files on a webpage using PHP and provide unique download links for file sharing while ensuring data integrity, you can store the uploaded files in a secure directory outside of the web root, generate unique download links using PHP, and use PHP to handle the file downloads to prevent direct access to the files. 

```php
<?php
// Define the directory where uploaded files are stored
$uploadDir = 'uploads/';

// Check if the file exists and is readable
if (isset($_GET['file']) && is_readable($uploadDir . $_GET['file'])) {
    // Set the headers for file download
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . basename($_GET['file']) . '"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($uploadDir . $_GET['file']));
    // Read the file and output its contents
    readfile($uploadDir . $_GET['file']);
    exit;
} else {
    echo 'File not found.';
}
?>
```

This PHP code snippet checks if the requested file exists in the specified directory, sets the appropriate headers for file download, and then outputs the file contents for download. This approach helps ensure data integrity by preventing direct access to the files and providing unique download links for file sharing.

Keywords

File uploading PHP display files download links data integrity

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