What potential issues can arise when setting a filename using CURLOPT_HEADERFUNCTION in PHP?

When setting a filename using CURLOPT_HEADERFUNCTION in PHP, a potential issue that can arise is that the filename may contain characters that are not allowed in a file name, such as slashes or colons. To solve this issue, you can sanitize the filename by removing any invalid characters before saving the file. 

// Sanitize the filename before saving the file
function saveFile($ch, $header) {
    if (preg_match('/Content-Disposition:.*filename=(.*)/', $header, $matches)) {
        $filename = preg_replace('/[^A-Za-z0-9_.-]/', '', $matches[1]);
        file_put_contents($filename, $matches[1]);
    }
    return strlen($header);
}

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://example.com/file.zip');
curl_setopt($ch, CURLOPT_HEADERFUNCTION, 'saveFile');
curl_exec($ch);
curl_close($ch);

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