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PHP SplPriorityQueue isEmpty() Function

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The SplPriorityQueue::isEmpty() function is an inbuilt function in PHP that is used to check whether the queue is empty or not.

Syntax:

bool SplPriorityQueue::isEmpty()

Parameters: This function does not accept any parameter.

Return Value: This function returns a boolean value either true or false depending upon the queue is empty or not.

 

Example 1:

PHP




<?php
  
// Declare empty class
class priorityQueue extends SplPriorityQueue {
}
  
// Create an object of priority queue
$obj = new priorityQueue();
  
// Use isEmpty() function to check
// priority queue is empty or not
var_dump($obj->isEmpty());
  
?>


Output

bool(true)

Example 2:

PHP




<?php
  
// Declare a class
class priorityQueue extends SplPriorityQueue {
      
    // Compare function to compare priority
    // queue elements
    public function compare($p1, $p2) {
        if ($p1 === $p2) return 0;
        return $p1 < $p2 ? -1 : 1;
    }
}
  
// Create an object of priority queue
$obj = new priorityQueue();
  
// Insert elements into the queue
$obj->insert("Geeks",2);
$obj->insert("GFG",1);
$obj->insert("G4G",3);
$obj->insert('G',4);
  
// Use isEmpty() function to check
// priority queue is empty or not
var_dump($obj->isEmpty());
  
?>


Output

bool(false)

Reference: https://www.php.net/manual/en/splpriorityqueue.isempty.php



Last Updated : 22 Apr, 2021
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