Extend function "html_options"

1. Add parameter datalist(type: bool, default: false) to generate <datalist> if set true
2. Add parameters placeholder_value and placeholder_output(type: string, default: null) to prepend <option value="$param['placeholder_value']" disabled>$param['placeholder_output']</option>
3. Add parameter option_class(type: string, default: null) to set option class or pass '' to omit option class (in current version class attribute adds to optiontags too - this break styles sometimes).

and start using SimpleXMLElement or DOMElement to generate tags - no need escape attribute values and detect boolean attributes:

$doc = (new DOMImplementation())->createDocument(null, 'html');
$tag = empty($param['datalist']) ? 'select' : 'datalist';
$parent = $html->appendChild($doc->createElement($tag));
foreach ($attributes as $key => $value) {
   $parent->setAttribute($key, $value);
}
foreach ($options as $key => $value) {
   $option = $parent->appendChild($doc->createElement('option', $value));
   $option->setAttribute('value', $key);
   if (in_array($key, (array) $selected, true)) {
      $option->setAttribute('selected', '');
   }
}
return $doc->saveHTML($parent);

Start at the existing html_options implementation and trace how it currently builds the select, attributes, and option tags. Review the requested datalist, placeholder, and option_class parameters alongside the proposed DOMElement approach. Done means the helper supports those parameters and generates correctly escaped select or datalist markup with the requested option attributes.