From the NannyMUD documentation

LAST CHANGE

2000-12-19

FUNCTION

NAME
        typep - Tell what type a variable has.


SYNTAX
	string typep(mixed arg)

DESCRIPTION
	This sfun returns a string describing the value sent to it:

	"int"		for ints,
	"string"	for strings,
	"object"	for objects,
	"mapping"	for mappings,
	"array"		for arrays of ints, strings or objects, and
	"mixed"		for everything else.