(PHP 5 >= 5.3.0, PHP 7, PHP 8)
MultipleIterator::attachIterator — Attaches iterator information
Attaches iterator information.
This function is currently not documented; only its argument list is available.
iteratorThe new iterator to attach.
info
       The associative information for the Iterator, which must be an
       int, a string, or null. 
      
Description...
   An IllegalValueException if the iterator parameter
   is invalid, or if info is already associated
   information.