PHP Ds\PriorityQueue clear() Function

Last Updated : 23 Aug, 2019

The Ds\PriorityQueue::clear() Function in PHP is used to clear all of the elements from a PriorityQueue instance. This function just clears the instance without deleting it.

Syntax:

void public Ds\PriorityQueue::clear ( void )

Parameters: This function does not accepts any parameters.

Return Value: This function does not returns any value.

Below programs illustrate the Ds\PriorityQueue::clear() Function in PHP:

Program 1:

<?php  
  
// Declare new PriorityQueue  
$pq = new \Ds\PriorityQueue();  
  
// Add elements to the PriorityQueue 
$pq->push("One", 1); 
$pq->push("Two", 2); 
$pq->push("Three", 3); 
  
echo "Initial PriorityQueue: \n"; 
// Display the PriorityQueue 
print_r($pq); 
  
// clear the PriorityQueue 
$pq->clear(); 
  
echo "\nPriorityQueue after clearing:\n"; 
print_r($pq); 
  
?>  

Output:

Initial PriorityQueue: 
Ds\PriorityQueue Object
(
    [0] => Three
    [1] => Two
    [2] => One
)

PriorityQueue after clearing:
Ds\PriorityQueue Object
(
)

Program 2:

<?php  
  
// Declare new PriorityQueue  
$pq = new \Ds\PriorityQueue();  
  
// Add elements to the PriorityQueue 
$pq->push("Geeks", 10); 
$pq->push("for", 20); 
$pq->push("Geeks", 30); 
  
echo "Initial PriorityQueue: \n"; 
// Display the PriorityQueue 
print_r($pq); 
  
// clear the PriorityQueue 
$pq->clear(); 
  
echo "\nPriorityQueue after clearing:\n"; 
print_r($pq); 
  
?>  

Output:

Initial PriorityQueue: 
Ds\PriorityQueue Object
(
    [0] => Geeks
    [1] => for
    [2] => Geeks
)

PriorityQueue after clearing:
Ds\PriorityQueue Object
(
)

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

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