The Ds\Queue::copy() Function in PHP is used to create a shallow copy of a particular Queue instance. This function does not affect the existing Queue instance, it just creates a shallow copy of the Queue and returns it.
Syntax:
Ds\Queue public Ds\Queue::copy ( void )
Parameters: This function does not accepts any parameters.
Return Value: This function creates a shallow copy of an existing Queue instance and returns it.
Below programs illustrate the Ds\Queue::copy() Function in PHP:
Program 1:
<?php   // Declare new Queue  $q = new \Ds\Queue();   // Add elements to the Queue $q->push("One"); $q->push("Two"); $q->push("Three");   // Create copy of this Queue // instance and print it print_r($q->copy());   ?> |
Output:
Ds\Queue Object
(
[0] => One
[1] => Two
[2] => Three
)
Program 2:
<?php   // Declare new Queue  $q = new \Ds\Queue();   // Add elements to the Queue $q->push("Geeks"); $q->push("for"); $q->push("Geeks");   // Create copy of this Queue // instance and print it print_r($q->copy());   ?> |
Output:
Ds\Queue Object
(
[0] => Geeks
[1] => for
[2] => Geeks
)
Reference: http://php.net/manual/en/ds-priorityqueue.copy.php
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