the SplStack is simply a SplDoublyLinkedList with an iteration mode IT_MODE_LIFO and IT_MODE_KEEP
A classe SplStack
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
Introdução
A classe SplStack fornece as principais funcionalidades de uma pilha implementada usando uma lista duplamente encadeada
definindo o modo do iterador como SplDoublyLinkedList::IT_MODE_LIFO.
Resumo da classe
/* Constantes herdadas */
/* Métodos herdados */
}Exemplos
Exemplo #1 Exemplo de SplStack
<?php
$q = new SplStack();
$q[] = 1;
$q[] = 2;
$q[] = 3;
foreach ($q as $elem) {
echo $elem."\n";
}
?>O exemplo acima produzirá:
3 2 1
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User Contributed Notes 5 notes
lsroudi at gmail dot com ¶
10 years ago
lincoln dot du dot j at gmail dot com ¶
6 years ago
<?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();
}
?>
Output
5
4
3
2
1
daryledesilva at gmail dot com ¶
4 years ago
<?php
// Exercise: Implement Queue using Stacks
class MyQueue {
protected $queue;
/**
* Initialize your data structure here.
*/
function __construct() {
$this->queue = new \SplStack;
}
/**
* Push element x to the back of queue.
* @param Integer $x
* @return NULL
*/
function push($x) {
$this->queue->push($x);
}
/**
* Removes the element from in front of queue and returns that element.
* @return Integer
*/
function pop() {
$length = count($this->queue);
$temp = [];
while(!$this->queue->isEmpty()){
$rv = $this->queue->pop();
if(!$this->queue->isEmpty()){
$temp[] = $rv;
}
}
for($i = count($temp)-1; $i >= 0; $i--){
$this->queue->push($temp[$i]);
}
return $rv;
}
/**
* Get the front element.
* @return Integer
*/
function peek() {
return $this->queue->bottom();
}
/**
* Returns whether the queue is empty.
* @return Boolean
*/
function empty() {
return $this->queue->isEmpty();
}
}
/**
* Your MyQueue object will be instantiated and called as such:
* $obj = MyQueue();
* $obj->push($x);
* $ret_2 = $obj->pop();
* $ret_3 = $obj->peek();
* $ret_4 = $obj->empty();
*/
lsroudi at gmail dot com ¶
10 years ago
<?php
/**
* Description of Stack
*
* (c) lsroudi <http://lsroudi.com/> <lsroudi@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
class Stack {
private $splstack;
function __construct(\SplStack $splstack)
{
$this->splstack = $splstack;
}
public function calculateSomme()
{
if ($this->splstack->count() > 1){
$val1 = $this->splstack->pop();
$val2 = $this->splstack->pop();
$val = $val1 + $val2;
$this->splstack->push($val);
$this->calculateSomme();
}
}
/**
*
* @return integer
*/
public function displaySomme()
{
$result = $this->splstack->pop();
return $result;
}
}
$splstack = new \SplStack();
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$splstack->push(10);
$stack = new Stack($splstack);
$stack->calculateSomme();
die(var_dump($stack->displaySomme())); // 150
?>
source : https://github.com/lsroudi/OOPWithSPL/blob/master/Stack/Stack.php
Sandro Alves Peres ¶
10 years ago
<?php
# Think of the stack as an array reversed, where the last element has index zero
$stack = new SplStack();
$stack->push('a');
$stack->push('b');
$stack->push('c');
$stack->offsetSet(0, 'C'); # the last element has index zero
$stack->rewind();
while( $stack->valid() )
{
echo $stack->current(), PHP_EOL;
$stack->next();
}
/*
OUTPUT
****************************
C
b
a
*/
?>
