SYNOPSIS
	object *filter_objects(object *arr, string fun, mixed extra, ...)

DESCRIPTION
	Similar to filter_array() but calls arr[n]->fun(extra, ...).
	If the call returns != 0, the object arr[n] ist included in
	the returned array.
	0-entries in arr are ignored.

SEE ALSO
	filter_array(E), map_array(E), map_objects(E)

