SplDoublyLinkedList implements Iterator  , ArrayAccess  , Countable  {
 
  public __construct ( void )
  public void add ( mixed $index , mixed $newval )
  //雙鏈表的頭部節(jié)點
  public mixed top ( void )
  //雙鏈表的尾部節(jié)點
  public mixed bottom ( void )
  //雙聯(lián)表元素的個數(shù)
  public int count ( void )
  //檢測雙鏈表是否為空
  public bool isEmpty ( void )
 
 
  //當(dāng)前節(jié)點索引
  public mixed key ( void )
  //移到上條記錄
  public void prev ( void )
  //移到下條記錄
  public void next ( void )
  //當(dāng)前記錄
  public mixed current ( void )
  //將指針指向迭代開始處
  public void rewind ( void )
  //檢查雙鏈表是否還有節(jié)點
  public bool valid ( void )
 
  //指定index處節(jié)點是否存在
  public bool offsetExists ( mixed $index )
  //獲取指定index處節(jié)點值
  public mixed offsetGet ( mixed $index )
  //設(shè)置指定index處值
  public void offsetSet ( mixed $index , mixed $newval )
  //刪除指定index處節(jié)點
  public void offsetUnset ( mixed $index )
 
  //從雙鏈表的尾部彈出元素
  public mixed pop ( void )
  //添加元素到雙鏈表的尾部
  public void push ( mixed $value )
 
  //序列化存儲
  public string serialize ( void )
  //反序列化
  public void unserialize ( string $serialized )
 
  //設(shè)置迭代模式
  public void setIteratorMode ( int $mode )
  //獲取迭代模式SplDoublyLinkedList::IT_MODE_LIFO (Stack style) SplDoublyLinkedList::IT_MODE_FIFO (Queue style)
  public int getIteratorMode ( void )
 
  //雙鏈表的頭部移除元素
  public mixed shift ( void )
  //雙鏈表的頭部添加元素
  public void unshift ( mixed $value )
 
}

$list = new SplDoublyLinkedList();
$list->push('a');
$list->push('b');
$list->push('c');
 
$list->unshift('top');
$list->shift();
 
print_r(array(
  'pop' => $list->pop(),
  'count' => $list->count(),
  'isEmpty' => $list->isEmpty(),
  'bottom' => $list->bottom(),
  'top' => $list->top()
));
 
$list->setIteratorMode(SplDoublyLinkedList::IT_MODE_FIFO);
print_r($list->getIteratorMode());
 
for($list->rewind(); $list->valid(); $list->next()) {
  echo $list->current().PHP_EOL;
}
 
print_r($a = $list->serialize());
//print_r($list->unserialize($a));
 
$list->offsetSet(0,'new one');
$list->offsetUnset(0);
print_r(array(
  'offsetExists' => $list->offsetExists(4),
  'offsetGet' => $list->offsetGet(0),
 
));
print_r($list);