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PHP Ds\Queue isEmpty() Function
  • Last Updated : 23 Aug, 2019

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

Syntax:

bool public Ds\Queue::isEmpty ( void )

Parameters: This function does not accepts any parameters.

Return Value: This function returns a boolean value based on whether this Queue is empty or not. It returns True if the Queue is empty otherwise it returns False.

Below programs illustrate the Ds\Queue::isEmpty() Function in PHP:



Program 1:




<?php 
  
// Declare new Queue 
$q = new \Ds\Queue(); 
  
// Initially Queue is Empty
var_dump($q->isEmpty());
  
// Add elements to the Queue 
$q->push("One");
$q->push("Two");
$q->push("Three");
  
// Check again if the Queue 
// is Empty
var_dump($q->isEmpty());
  
?> 
Output:
bool(true)
bool(false)

Program 2:




<?php 
  
// Declare new Queue 
$q = new \Ds\Queue(); 
  
// Initially Queue is Empty
var_dump($q->isEmpty());
  
// Add elements to the Queue 
$q->push("Geeks");
$q->push("for");
$q->push("Geeks");
  
// Check again if the Queue 
// is Empty
var_dump($q->isEmpty());
  
?> 
Output:
bool(true)
bool(false)

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

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