PHP | Ds\Collection copy() Function

The Ds\Collection::copy() function is an inbuilt function in PHP which is used to returns the copy of collection element.

Syntax:

Ds\Collection::copy ( void ) : Ds\Collection

Parameters: This function does not accept any parameter.

Return Value: It returns the copy of collection element.

Below programs illustrate the Ds\Collection::copy() function in PHP:

Example 1:

<?php

// Create a collection
$collection = new \Ds\Vector([10, 15, 21, 13, 16, 18]);

// Display the collection element
print_r($collection);

// Use copy() function to remove elements
$collection->copy();

// Display the collection element
print_r($collection);

?>

Output:

Ds\Vector Object ( 
    [0] => 10 
    [1] => 15 
    [2] => 21 
    [3] => 13 
    [4] => 16 
    [5] => 18 
) 
Ds\Vector Object ( 
    [0] => 10 
    [1] => 15 
    [2] => 21 
    [3] => 13 
    [4] => 16 
    [5] => 18 
) 

Example 2:

<?php

// Create a collection
$collection = new \Ds\Vector([10, 15, 21, 13, 16, 18]);

// Display the collection element
print_r($collection);

// Use copy() function to remove elements
$collection->copy();

// Pop an element from collection
$collection->pop();

// Display the collection element
print_r($collection);

?>

Output:

Ds\Vector Object ( 
    [0] => 10 
    [1] => 15 
    [2] => 21 
    [3] => 13 
    [4] => 16 
    [5] => 18 
) 
Ds\Vector Object ( 
    [0] => 10 
    [1] => 15 
    [2] => 21 
    [3] => 13 
    [4] => 16 
) 

Reference: http://php.net/manual/en/ds-collection.copy.php