Использование метода ParseComponentPath

<?php
require_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");

$arUrlTemplates = [
    "category" => "#CATEGORY_CODE#/",
    "subcategory" => "#CATEGORY_CODE#/#SUBCATEGORY_CODE#/",
    "product" => "#CATEGORY_CODE#/#SUBCATEGORY_CODE#/#PRODUCT_ID#"
];

$SEF_FOLDER = "/shop/";
$requestURL = "/shop/books/fiction/987";

$arVariables = [];
$page = CComponentEngine::ParseComponentPath($SEF_FOLDER, $arUrlTemplates, $arVariables, $requestURL);

echo "Определена страница: " . $page . "\n";
echo "Извлечённые переменные: " . print_r($arVariables, true);

// Выведет:
// Определена страница: product
// Извлечённые переменные: Array ( [CATEGORY_CODE] => books [SUBCATEGORY_CODE] => fiction [PRODUCT_ID] => 987 )