PHP Ds\Queue clear() Function

The Ds\Queue::clear() Function in PHP is used to clear all of the elements from a Queue 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\Queue::clear() function in PHP:

Program 1:

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<?php 
  
// Declare new Queue 
$q = new \Ds\Queue(); 
  
// Add elements to the Queue 
$q->push("One");
$q->push("Two");
$q->push("Three");
  
echo "Initial Queue: \n";
// Display the Queue 
print_r($q);
  
// clear the Queue 
$q->clear();
  
echo "\nQueue after clearing:\n";
print_r($q);
  
?> 

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Output:

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

Queue after clearing:
Ds\Queue Object
(
)

Program 2:

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<?php 
  
// Declare new Queue 
$q = new \Ds\Queue(); 
  
// Add elements to the Queue 
$q->push("Geeks");
$q->push("for");
$q->push("Geeks");
  
echo "Initial Queue: \n";
// Display the Queue 
print_r($q);
  
// clear the Queue 
$q->clear();
  
echo "\nQueue after clearing:\n";
print_r($q);
  
?> 

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Output:

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

Queue after clearing:
Ds\Queue Object
(
)

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



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