PHP Ds\PriorityQueue isEmpty() Function

The isEmpty() Function of Ds\PriorityQueue class in PHP is used to whether a particular PriorityQueue instance is empty or not. It returns True if the PriorityQueue is empty otherwise it returns False. Syntax:

bool isEmpty( )

Parameters: This function does not accepts any parameters. Return Value: This function returns a boolean value based on whether this PriorityQueue is empty or not. It returns True if the PriorityQueue is empty otherwise it returns False. Below programs illustrate the above method: Program 1: php

<?php 

// Declare new PriorityQueue 
$pq = new \Ds\PriorityQueue(); 

// Initially PriorityQueue is Empty
var_dump($pq->isEmpty());

// Add elements to the PriorityQueue
$pq->push("One", 1);
$pq->push("Two", 2);
$pq->push("Three", 3);

// Check again if the PriorityQueue
// is Empty
var_dump($pq->isEmpty());

?> 

Program 2: php

<?php 

// Declare new PriorityQueue 
$pq = new \Ds\PriorityQueue(); 

// Initially PriorityQueue is Empty
var_dump($pq->isEmpty());

// Add elements to the PriorityQueue
$pq->push("Geeks", 1);
$pq->push("for", 2);
$pq->push("Geeks", 3);

// Check again if the PriorityQueue
// is Empty
var_dump($pq->isEmpty());

?> 

Reference: http://php.net/manual/en/ds-priorityqueue.isempty.php