PHP | DsStack isEmpty() Function

PHP Ds\Set isEmpty() Function

Last Updated : 16 Aug, 2019

The Ds\Set::isEmpty() function of Ds\Set class in PHP is an inbuilt function which is used to check whether a set is empty or not. If the Set instance is empty then this function returns true otherwise it returns False. Syntax:

bool public Ds\Set::isEmpty ( void )

Parameters: This function does not accepts any parameters. Return Value: This function returns a boolean value depending on whether the Set is empty or not. If the Set instance is empty then this function returns true otherwise it returns False. Below programs illustrate the Ds\Set::isEmpty() function: Program 1:

php

<?php 

// Declare new Set
$set = new \Ds\Set(); 

// Display the Set element 
var_dump($set); 

// Check if set is empty
if($set->isEmpty())
    echo "Set is Empty";

?>

Output:

object(Ds\Set)#1 (0) {
}
Set is Empty

Program 2:

php

<?php 

// Declare new Set
$set = new \Ds\Set(["Geeks", "for", "Keegs"]); 

// Display the Set element 
var_dump($set); 

// Check if Set is Empty
if($set->isEmpty()==0)
    echo "Set is Not Empty";

?>

Output:

object(Ds\Set)#1 (3) {
  [0]=>
  string(5) "Geeks"
  [1]=>
  string(3) "for"
  [2]=>
  string(5) "Keegs"
}
Set is Not Empty

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

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