Ds\Queue::peek

(PECL ds >= 1.0.0)

Ds\Queue::peek — Returns the value at the front of the queue

Descrierea

public Ds\Queue::peek ( void ) : mixed

Returns the value at the front of the queue, but does not remove it.

Parametri

Această funcție nu are parametri.

Valorile întoarse

The value at the front of the queue.

Erori/Excepții

UnderflowException if empty.

Exemple

Example #1 Ds\Queue::peek() example

<?php
$queue = new \Ds\Queue();

$queue->push("a");
$queue->push("b");
$queue->push("c");

var_dump($queue->peek());
?>

Exemplul de mai sus va afișa ceva similar cu:

string(1) "a"