Хостер утверждает, что ограничений на данную папку нет.
Вот дословный ответ от технической поддержки хостинга:Ограничение на директорию tmp отсутствуют, у нас нет жесткого лимита на размер занимаемым файлами клиента. На сколько мы видим, вы упираетесь в максимальный размер куки 4кб. Каждый раз, когда происходит переход на сайту в куки дописывается информация по переходу. Рекомендуем поправить это и, как вы и писали, писать в сессии. К примеру, кука у нас, когда выводится ошибка выглядит:
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первый и второй переход:
"call_last_visit=1433774423; call_session=true; call_referrer=%D0%9D%D0%B0%D0%BF%D1%80%D1%8F%D0%BC%D1%83%D1%8E; call_visit=1; call_moving=%5B%7B%22call_href%22%3A%20%22http%3A%2F%2Ftoymart-shop.ru%2Fproduct%2Fyaschik_dlya_hraneniya_igrushek_Optima_gorod_2584BQ-2073%2F%22%2C%20%22call_title%22%3A%22%D0%9A%D1%83%D0%BF%D0%B8%D1%82%D1%8C%20%D0%AF%D1%89%D0%B8%D0%BA%20%D0%B4%D0%BB%D1%8F%20%D1%85%D1%80%D0%B0%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F%20%D0%B8%D0%B3%D1%80%D1%83%D1%88%D0%B5%D0%BA%20Optima%20%D0%93%D0%BE%D1%80%D0%BE%D0%B4%202584BQ-%D0%93%D0%A0%20%D0%BD%D0%B5%D0%B4%D0%BE%D1%80%D0%BE%D0%B3%D0%BE%20%D0%B2%20%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B5%22%2C%20%22call_time%22%3A%221433774423%22%7D%5D; PHPSESSID=gk8sasj8rgk534k2p3h3cqil57; __utmt=1; __utma=258983567.1806877406.1433774424.1433774424.1433774424.1; __utmb=258983567.1.10.1433774424; __utmc=258983567; __utmz=258983567.1433774424.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); _ym_visorc_22732024=w"
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Как использовать полученную информацию? В каком файле, что надо подправить?