PHP Ds\PriorityQueue peek() Function

PHP Ds\PriorityQueue isEmpty() Function

Last Updated : 28 Feb, 2019

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  
  
// 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  
  
// 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

PHP Ds\PriorityQueue peek() Function

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