PHP - 有没有办法找到PDF是否是可填写的PDF

I know using the following code, we can check if the file is a PDF or Not.Is there a way in PHP to check if the PDF is a fillable PDF or a Normal PDF.

$finfo = finfo_open(FILEINFO_MIME_TYPE);
foreach (glob("path/to/files") as $filename) {
    if(finfo_file($finfo, $filename) === 'application/pdf') {
        echo "'{$filename}' is a PDF" . PHP_EOL;
    } else {
        echo "'{$filename}' is not a PDF" . PHP_EOL;
    }
}
finfo_close($finfo);