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(PHP 5 >= 5.1.0)
RecursiveArrayIterator::getChildren — Returns an iterator for the current entry if it is an array or an object .
Returns an iterator for the current iterator entry.
此函数没有参数。
An iterator for the current entry, if it is an array or object .
An InvalidArgumentException will be thrown if the current entry does not contain an array or an object .
Example #1 RecursiveArrayIterator::getChildren() example
  <?php
$fruits  = array( "a"  =>  "lemon" ,  "b"  =>  "orange" , array( "a"  =>  "apple" ,  "p"  =>  "pear" ));
 $iterator  = new  RecursiveArrayIterator ( $fruits );
while ( $iterator -> valid ()) {
    if ( $iterator -> hasChildren ()) {
         // print all children
         foreach ( $iterator -> getChildren () as  $key  =>  $value ) {
            echo  $key  .  ' : '  .  $value  .  "\n" ;
        }
    } else {
        echo  "No children.\n" ;
    }
     $iterator -> next ();
}
 ?>   以上例程会输出:
No children. No children. a : apple p : pear
[#1] 814ckf0x [2014-03-05 20:44:39]
RecursiveArrayIterator::getChildrens returns a copy of the children, not a reference:
<?php
$stack = array ("some" => "value",
                array ("subsome" => "subvalue", array ("subsubsome" => "subsubvalue")),
                "some1" => "value1");
$object = new RecursiveArrayIterator ($stack);
$object->next ();
$second_object = &$object->getChildren ();
$second_object->next ();
$third_object = &$second_object->getChildren ();
$third_object->offsetSet ("subsubsome", "subsubdiferent");
var_dump ($object);
var_dump ($second_object);
var_dump ($third_object);
?>
returns: 
object(RecursiveArrayIterator)#1 (1) {
  ["storage":"ArrayIterator":private]=>
  array(3) {
    ["some"]=>
    string(5) "value"
    [0]=>
    array(2) {
      ["subsome"]=>
      string(8) "subvalue"
      [0]=>
      array(1) {
        ["subsubsome"]=>
        string(11) "subsubvalue" <--- expected to be changed
      }
    }
    ["some1"]=>
    string(6) "value1"
  }
}
object(RecursiveArrayIterator)#2 (1) {
  ["storage":"ArrayIterator":private]=>
  array(2) {
    ["subsome"]=>
    string(8) "subvalue"
    [0]=>
    array(1) {
      ["subsubsome"]=>
      string(11) "subsubvalue" <--- expected to be changed
    }
  }
}
object(RecursiveArrayIterator)#3 (1) {
  ["storage":"ArrayIterator":private]=>
  array(1) {
    ["subsubsome"]=>
    string(14) "subsubdiferent"
  }
}