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\Queue::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:
PHP
<?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);?> |
Output:
Initial Queue:
Ds\Queue Object
(
[0] => One
[1] => Two
[2] => Three
)
Queue after clearing:
Ds\Queue Object
(
)
Program 2:
PHP
<?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);?> |
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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