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PHP Ds\PriorityQueue isEmpty() Function

Last Updated : 28 Feb, 2019
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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());

?>
Output: 
bool(true)
bool(false)
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());

?>
Output: 
bool(true)
bool(false)
Reference: http://php.net/manual/en/ds-priorityqueue.isempty.php

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