008+ [a] => |-ArrayPOSTFIX
009+
010+ Fatal error: Uncaught UnexpectedValueException: Objects returned by RecursiveIterator::getChildren() must implement RecursiveIterator in %s/recursive_tree_iterator_setpostfix.php:35
011+ Stack trace:
012+ #0 %s/recursive_tree_iterator_setpostfix.php(35): RecursiveTreeIterator->next()
013+ #1 {main}
014+ thrown in %s/recursive_tree_iterator_setpostfix.php on line 35
008- [0] => |-ArrayPOSTFIX
009- [0] => | |-aPOSTFIX
010- [1] => | \-1POSTFIX
011- [a] => \-ArrayPOSTFIX
012- [0] => |-2POSTFIX
013- [1] => |-bPOSTFIX
014- [3] => \-ArrayPOSTFIX
015- [0] => |-4POSTFIX
016- [1] => \-cPOSTFIX
017- ----
018-
019-
020- ----
021- [0] => |-Array
022- [0] => | |-a
023- [1] => | \-1
024- [a] => \-Array
025- [0] => |-2
026- [1] => |-b
027- [3] => \-Array
028- [0] => |-4
029- [1] => \-c
030- ===DONE===