PHP에서 안정적인 대용량 파일 다운로드를 보장하려면 어떻게 해야 합니까?

// Determine the file path and filename
$filename = $filePath . $filename;

// Set chunk size (adjust based on server and file size requirements)
$chunkSize = 5 * (1024 * 1024); // 5 MB

// Check if file exists
if (file_exists($filename)) {
    // Set download headers and prepare for transfer
    set_time_limit(300);
    $size = intval(sprintf("%u", filesize($filename)));
    header('Content-Type: application/octet-stream');
    header('Content-Transfer-Encoding: binary');
    header('Content-Length: ' . $size);
    header('Content-Disposition: attachment;filename="' . basename($filename) . '"');

    // If file is larger than chunk size, use loop to send chunks
    if ($size > $chunkSize) {
        $handle = fopen($filename, 'rb');
        while (!feof($handle)) {
            print(@fread($handle, $chunkSize));
            ob_flush();
            flush();
        }
        fclose($handle);
    } else {
        // Read and output the entire file in one go
        readfile($path);
    }

    exit;
} else {
    echo 'File "' . $filename . '" does not exist!';
}