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$dom_document = new DOMDocument();
$html = mb_convert_encoding($html, 'HTML-ENTITIES', "UTF-8"); 

$dom_document->loadHTML($html);

$dom_xpath = new DOMXpath($dom_document);

$options = $dom_xpath->query("*/select[@name='jform[firma_z_katalogu]']/option");
foreach ($options as $option) {
    if($option->getAttribute('value') == $firmaId) {
        $firmaZKatalogu = '<select id="jform_firma_z_katalogu" name="jform[firma_z_katalogu]">'
                         .'<option value="'.$firmaId.'" >'.$option->nodeValue.'</option>'
                         .'</select>';
    }   
    
}