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Bug #72063 SplQueue and SplStack outputs the same
Submitted: 2016-04-20 11:40 UTC Modified: 2016-04-20 20:34 UTC
From: zavalit at gmail dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 7.0.5 OS: Ubuntu 14.04
Private report: No CVE-ID: None
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 [2016-04-20 11:40 UTC] zavalit at gmail dot com 
Description:
------------
class MyStorage extends SplStack{}

$closure = function($elem){
  $this->push($elem);
  return $this;
};

$stack = $closure->call(new MyStorage(), 1);
$stack = $closure->call($stack, 2);

echo $stack->pop(); // return 2
------------------------------------

------------------------------------
class MyStorage extends SplQueue{}

$closure = function($elem){
  $this->push($elem);
  return $this;
};

$stack = $closure->call(new MyStorage(), 1);
$stack = $closure->call($stack, 2);

echo $stack->pop(); // return 2

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 [2016-04-20 20:34 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2016-04-20 20:34 UTC] requinix@php.net 
That's right: both classes implement the push/pop/shift/unshift methods (by inheritance from SplDoublyLinkedList) while only SplQueue implements enqueue and dequeue.

If you want a stack then use SplStack and push/pop (or shift/unshift). If you want to use a queue then use SplQueue and enqueue/dequeue (or push/shift or pop/unshift).
 
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