mixed get ([string $hash = 'default'], int $mask)
Filter bit mask.
1=no trim: If this flag is cleared and the input is a string, the string will have leading and trailing whitespace trimmed.
2=allow_raw: If set, no more filtering is performed, higher bits are ignored.
4=allow_html: HTML is allowed, but passed through a safe HTML filter first. If set, no more filtering is performed. If no bits other than the 1 bit is set, a strict filter is applied.
прим.: при hash='default' берется массив $_REQUEST
