PHP 双链表(SplDoublyLinkedList)简介和使用实例

SplDoublyLinkedList implements Iterator , ArrayAccess , Countable {
 
public __construct ( void )
public void add ( mixed $index , mixed $newval )
//双链表的头部节点
public mixed top ( void )
//双链表的尾部节点
public mixed bottom ( void )
//双联表元素的个数
public int count ( void )
//检测双链表是否为空
public bool isEmpty ( void )
 
 
//当前节点索引
public mixed key ( void )
//移到上条记录
public void prev ( void )
//移到下条记录
public void next ( void )
//当前记录
public mixed current ( void )
//将指针指向迭代开始处
public void rewind ( void )
//检查双链表是否还有节点
public bool valid ( void )
 
//指定index处节点是否存在
public bool offsetExists ( mixed $index )
//获取指定index处节点值
public mixed offsetGet ( mixed $index )
//设置指定index处值
public void offsetSet ( mixed $index , mixed $newval )
//删除指定index处节点
public void offsetUnset ( mixed $index )
 
//从双链表的尾部弹出元素
public mixed pop ( void )
//添加元素到双链表的尾部
public void push ( mixed $value )
 
//序列化存储
public string serialize ( void )
//反序列化
public void unserialize ( string $serialized )
 
//设置迭代模式
public void setIteratorMode ( int $mode )
//获取迭代模式SplDoublyLinkedList::IT_MODE_LIFO (Stack style) SplDoublyLinkedList::IT_MODE_FIFO (Queue style)
public int getIteratorMode ( void )
 
//双链表的头部移除元素
public mixed shift ( void )
//双链表的头部添加元素
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);