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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