PHP Ds\Queue isEmpty() Function

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

<?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

<?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: https://www.php.net/manual/en/ds-priorityqueue.isempty.php

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