Breadcrumbs template for bitrix with schema org and use bootstrap 4

breadcrumbs.html

<nav class="breadcrumb px-0" aria-label="breadcrumb" itemprop="http://schema.org/breadcrumb" itemscope="" itemtype="http://schema.org/BreadcrumbList">
    <div class="breadcrumb-item" id="breadcrumb_0" itemprop="itemListElement" itemscope="" itemtype="http://schema.org/ListItem">
        <a href="https://my.site/" content="https://my.site/" title="SITE NAME" itemprop="item">
            <span itemprop="name">SITE NAME</span>
        </a>
        <meta itemprop="position" content="1">
    </div>
    <div class="breadcrumb-item" id="breadcrumb_1" itemprop="itemListElement" itemscope="" itemtype="http://schema.org/ListItem">
        <a href="https://my.site/root-section/" content="https://my.site/catalog/" title="ROOT SECTION NAME" itemprop="item">
            <span itemprop="name">ROOT SECTION NAME</span>
        </a>
        <meta itemprop="position" content="2">
    </div>
    <div class="breadcrumb-item" id="breadcrumb_2" itemprop="itemListElement" itemscope="" itemtype="http://schema.org/ListItem">
        <a href="https://my.site/root-section/inherit-section/" content="https://my.site/catalog/absent/" title="INHERIT SECTION NAME" itemprop="item">
            <span itemprop="name">INHERIT SECTION NAME</span>
        </a>
        <meta itemprop="position" content="3">
    </div>
    <div class="breadcrumb-item active" aria-current="page" itemprop="itemListElement" itemscope="" itemtype="http://schema.org/ListItem">
        <span title="ELEMENT NAME" itemprop="item" content="https://my.site/root-section/inherit-section/element/">
            <span itemprop="name">ELEMENT NAME</span>
        </span>
        <meta itemprop="position" content="4">
    </div>
</nav>

breadcrumbs.php

<?php
if (!defined("B_PROLOG_INCLUDED") || B_PROLOG_INCLUDED !== true) {
    die();
}

/**
 * @global CMain $APPLICATION
 * @var array $arParams
 * @var array $arResult
 */

global $APPLICATION;

//delayed function must return a string
if (empty($arResult)) {
    return "";
}

$strReturn = '';

$strReturn .= '<nav class="breadcrumb px-0" aria-label="breadcrumb" itemprop="http://schema.org/breadcrumb" itemscope itemtype="http://schema.org/BreadcrumbList">';

$items = count($arResult);
$proto = $_SERVER['SERVER_PORT'] == 443 ? 'https://' : 'http://';
$host = $_SERVER['HTTP_HOST'];
$site = $proto . $host;
for ($index = 0; $index < $items; $index++) {
    $title = htmlspecialcharsex($arResult[$index]["TITLE"]);

    if ($arResult[$index]["LINK"] <> "" && $index != $items - 1) {
        $strReturn .= '
			<div class="breadcrumb-item" id="breadcrumb_' . $index . '" itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
				<a href="' . $site . $arResult[$index]["LINK"] . '" content="' . $site . $arResult[$index]["LINK"] . '" title="' . $title . '" itemprop="item">
					<span itemprop="name">' . $title . '</span>
				</a>
				<meta itemprop="position" content="' . ($index + 1) . '" />
			</div>';
    } else {
        $strReturn .= '
			<div class="breadcrumb-item active" aria-current="page" itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
				<span title="' . $title . '" itemprop="item" content="' . $site . $APPLICATION->GetCurUri() . '">
					<span itemprop="name">' . $title . '</span>
				</span>
				<meta itemprop="position" content="' . ($index + 1) . '" />
			</div>';
    }
}

$strReturn .= '</nav>';

return $strReturn;