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