TYPO3 Custom condition to check if beLayout selected for page or its parent(s) matches required value

AdditionalConfiguration.php

<?php

/**
 * Condition to check if beLayout selected for page or its parent(s) matches required value
 *
 * @param int $layout UID of layout to check
 *
 * @return bool True if first `found be_layout` OR `backend_layout_next_level` matches the param
 */
function user_beLayout($layout) {

    if (TYPO3_MODE != 'FE') return false;

    // If layout is set but doesn't match > return false
    if ($GLOBALS["TSFE"]->page["backend_layout"] > 0)
        return $GLOBALS["TSFE"]->page["backend_layout"] == $layout;

    // Otherwise search in rootline for first set `Next level layout` and check if it matches param
    foreach ($GLOBALS["TSFE"]->rootLine as $page)
        if ($page["backend_layout_next_level"] > 0)
            return ($page["backend_layout_next_level"] == $layout);

    return false;
}

/**
 * TypoScript usage: (according to https://docs.typo3.org/typo3cms/TyposcriptReference/Conditions/Reference/Index.html#condition-userfunc)
 *
 * [userFunc = user_beLayout(2)]
 *    // some typoscript
 * [end]
 *
 */