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What are some common challenges when trying to implement a download script in PHP?

One common challenge when implementing a download script in PHP is handling large file downloads, as it can consume a lot of server resources and potentially lead to timeouts. To solve this, you can use PHP's `readfile()` function, which efficiently streams the file to the client without loading it into memory.

php 
$file = 'path/to/file.zip';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename=' . basename($file));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
} else {
    echo 'File not found.';
}

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