Logical Filters *int*: Returns the data as an integer. *boolean*: Returns true for '1' and true and 'false' for '0' and 'false'. *float*: Returns the data as a floating point value. *regexp*: Matches the input value as a string against the regular expression. If there is a match then the string is returned, otherwise the filter returns "false". Remarks: Only available if pcre has been compiled into PHP.