SYNOPSIS
	int sizeof(mixed arr)

DESCRIPTION
	Returns the number of elements of an array or or the number of
        keys in a mapping.

	For scalar values (like integers), 0 is returned.

        Note: this efun is also available under the name 'm_sizeof(E)'.
        Usage of that name however is deprecated.

SEE ALSO
	strlen(E), allocate(E), pointerp(E),
	mappingp(E), allocate_mapping(E), widthof(E)
