How can a custom permissions system be implemented in PHP to control file downloads based on user access rights?

To implement a custom permissions system in PHP to control file downloads based on user access rights, you can create a function that checks the user's permissions before allowing the download to proceed. This function can be called before serving the file to the user, ensuring that only users with the appropriate access rights can download the file. 

function checkPermissions($userRole, $fileAccessLevel) {
    // Define user roles and corresponding access levels
    $accessLevels = [
        'admin' => 3,
        'editor' => 2,
        'viewer' => 1,
    ];

    // Check if user has sufficient access level
    if ($accessLevels[$userRole] >= $fileAccessLevel) {
        return true;
    } else {
        return false;
    }
}

$userRole = 'admin'; // User's role
$fileAccessLevel = 2; // Required access level to download the file

if (checkPermissions($userRole, $fileAccessLevel)) {
    // Serve the file for download
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="file.txt"');
    readfile('file.txt');
} else {
    echo 'You do not have permission to download this file.';
}

Keywords

PHP custom permissions system file downloads user access rights implementation

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