[Bài đọc] Lớp SplStack

[Bài đọc] Lớp SplStack

Lớp SplStack cung cấp các chức năng chính của một stack, được triển khai bằng cách sử dụng danh sách liên kết đôi.

Mô tả ngắn gọn của lớp SplStack như sau:

SplStack extends SplDoublyLinkedList implements Iterator , ArrayAccess , Countable { 
   /* Methods */ 
   __construct ( void ) 
   setIteratorMode ( int $mode ) : void    
/* Inherited methods */   
 public SplDoublyLinkedList::add ( mixed $index , mixed $newval ) : void  
  public SplDoublyLinkedList::bottom ( void ) : mixed    public 
SplDoublyLinkedList::count ( void ) : int    public 
SplDoublyLinkedList::current ( void ) : mixed    public 
SplDoublyLinkedList::getIteratorMode ( void ) : int    public 
SplDoublyLinkedList::isEmpty ( void ) : bool    public 
SplDoublyLinkedList::key ( void ) : mixed    public 
SplDoublyLinkedList::next ( void ) : void    public 
SplDoublyLinkedList::offsetExists ( mixed $index ) : bool    public 
SplDoublyLinkedList::offsetGet ( mixed $index ) : mixed    public 
SplDoublyLinkedList::offsetSet ( mixed $index , mixed $newval ) : void
    public SplDoublyLinkedList::offsetUnset ( mixed $index ) : void 
   public SplDoublyLinkedList::pop ( void ) : mixed    public 
SplDoublyLinkedList::prev ( void ) : void    public 
SplDoublyLinkedList::push ( mixed $value ) : void    public 
SplDoublyLinkedList::rewind ( void ) : void    public 
SplDoublyLinkedList::serialize ( void ) : string    public 
SplDoublyLinkedList::setIteratorMode ( int $mode ) : void    public 
SplDoublyLinkedList::shift ( void ) : mixed    public 
SplDoublyLinkedList::top ( void ) : mixed    public 
SplDoublyLinkedList::unserialize ( string $serialized ) : void 
   public SplDoublyLinkedList::unshift ( mixed $value ) : void   
 public SplDoublyLinkedList::valid ( void ) : bool}

Sử dụng SplStack

<?php
//SplStack Mode is LIFO (Last In First Out)
$q = new SplStack();
$q[] = 1;$q[] = 2;
$q[] = 3;
$q->push(4);
$q->add(4,5);
$q->rewind();
while($q->valid()){  
  echo $q->current(),"\n";  
  $q->next();}

Kết quả:

5
4
3
2
1

Lưu ý: Học viên tra cứu đầy đủ lớp SplStack ở đây: https://www.php.net/manual/en/class.splstack.php