PHP如何使用Ds\Vector copy()函数？

DsVector public DsVector::copy( void )

<?php
  
// Create a vector array
$arr1 = new DsVector([1, 2, 3, 5]);
  
// Use copy() function to copy
// the vector array
$arr2 = $arr1 -> copy ();
  
echo ( "Original Array n" );
  
// Display the original array
print_r( $arr1 );
  
echo ( "Copied Array n" );
  
// Display the copied array
print_r( $arr2 );
  
?>

Original Array 
DsVector Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 5
)
Copied Array 
DsVector Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 5
)

<?php
  
// Create a vector array
$arr1 = new DsVector([ "geeks" , "for" , "geeks" ]);
  
// Use copy() function to copy
// the vector array
$arr2 = $arr1 -> copy ();
  
echo ( "Original Arrayn" );
  
// Display the original array
print_r( $arr1 );
  
echo ( "Copied Arrayn" );
  
// Display the copied array
print_r( $arr2 );
  
?>

Original Array
DsVector Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)
Copied Array
DsVector Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)