if (!defined('B_PROLOG_INCLUDED') || B_PROLOG_INCLUDED !== true) die();

AddEventHandler("sale", "OnBeforeBasketAdd", function (&$arFields) {
    $arFields = false; // Блокируем добавление в корзину
    return false;
});

AddEventHandler("main", "OnEpilog", function () {
    // Скрываем кнопку "В корзину" через PHP
    global $APPLICATION;
    $APPLICATION->AddViewContent("page_body", '<style>.b-pay__button, .b-pay__add2basket, .js-add2basket, .btn-primary, .btn-primary-custom, .waves-effect { display: none !important; }</style>');
});<pre>[RuntimeException] 
Could not start session because headers have already been sent. &quot;/home/c/compozit/dev.t-decks.ru/public_html/bitrix/init.php&quot;:1. (0)
/home/c/compozit/dev.t-decks.ru/public_html/bitrix/modules/main/lib/session/session.php:144
#0: Bitrix\Main\Session\Session-&gt;start()
	/home/c/compozit/dev.t-decks.ru/public_html/bitrix/modules/main/lib/session/kernelsessionproxy.php:47
#1: Bitrix\Main\Session\KernelSessionProxy-&gt;start()
	/home/c/compozit/dev.t-decks.ru/public_html/bitrix/modules/main/include.php:168
#2: require_once(string)
	/home/c/compozit/dev.t-decks.ru/public_html/bitrix/modules/main/include/prolog_before.php:19
#3: require_once(string)
	/home/c/compozit/dev.t-decks.ru/public_html/bitrix/modules/main/include/prolog.php:10
#4: require_once(string)
	/home/c/compozit/dev.t-decks.ru/public_html/bitrix/header.php:1
#5: require(string)
	/home/c/compozit/dev.t-decks.ru/public_html/index.php:1
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</pre>