I was trying to extend SplPriorityQueue like this:
<?php
class AdjustablePriorityQueue extends SplPriorityQueue {
protected $direction='desc';//queue is ordered highest to lowest priority, direction is changeable ONLY on __construct()
function __construct($direction='desc'){
parent::__construct(); //Fatal error: Cannot call constructor
$this->direction=($direction=='asc') ? 'asc': 'desc';
}
function compare($priority1,$priority2){
if($this->direction=='asc') return parent::compare($priority2, $priority1);
return parent::compare($priority1,$priority2);
}
}
?>
calling `parent::__construct()` gives a fatal error " Cannot call constructor". If I leave out that call, everything works fine. This suggests that SplPriorityQueue does not actually have a `__construct()` method.
SplPriorityQueue::__construct
(PHP 5 >= 5.3.0, PHP 7)
SplPriorityQueue::__construct — Constructs a new empty queue
Descrierea
public SplPriorityQueue::__construct
(
)
This constructs a new empty queue.
Parametri
Această funcție nu are parametri.
Valorile întoarse
Nu este întoarsă nici o valoare.
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User Contributed Notes 1 note
Jennifer ¶
13 years ago
