PHP 双链表(SplDoublyLinkedList)简介和使用实例

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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 )

}

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$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);