How to reset the announcement variable in Bitrix?

Question

PHP

in the product card there is a piece of such code

<?if(strlen($arResult["PREVIEW_TEXT"])):?>
          <div class="preview_text"><?=$arResult["PREVIEW_TEXT"]?></div>
        <?endif;?>
      </div>

PREVIEW_TEXT stores the announcement values ​​for the card -
so, these values ​​​​come from 1s, I need to "reset" them, because there the name and the announcement are the same, they must be filled in manually (text 500 characters) if I turn it off in 1s this parameter, the values ​​will still remain, how can I reset them correctly so that the copywriter starts filling them in from "Zero"?

Answer 1

Use the CIBlockElement::Update() method .
You can call it directly on the command line in the admin panel if you need to reset it once.
Of course, you should first make a backup and be careful when specifying the method parameters so as not to break firewood.