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Многочисленные ошибки, в частности при отправке жалобы на коммент если идут warning, а они идут, если конечно не выставлено отображение ошибок в Нет
ИМХО для современных версий php, даже начиная с 5,6 актуально.
ЗЫ. Это касается только аякс-ответов, где напрямую варнинги не видны