// universal delete file and dirs (Windows, Other os)
function DeleteFileString(string $file) {
    if(is_file($file = strOsSlesh($file))) {
        return unlink($file);
    } elseif(is_dir($file)) {
        return (DIRECTORY_SEPARATOR == '\') ?
            `rd /S /q $file` // Windows delele all files
        :   `rm -rf  $file`; // Other os delele all files
    }
    return false;
}

[php] => 7.3.4
[DeleteFileString] => 5.343348
[IteratorDeleteDir] => 11.705709
[scandirDelete] => 11.533627
[globDelete] => 13.708378
[opendirDelete] => 11.481467
)