PHP Ds Deque copy()函数用法介绍

2021年3月13日16:11:58 发表评论 1,003 次浏览

Ds \ Deque :: copy()function是PHP中的内置函数, 用于返回Deque的副本。这将返回Deque的浅表副本。

语法如下:

public Ds\Deque::copy ( void ) : Ds\Deque

参数:此函数不包含任何参数。

返回值:此函数返回Deque元素的副本。

下面的程序说明了Ds \ Deque :: copy()PHP中的功能:

程序1:

<?php
  
// Declare deque
$deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);
  
echo ( "Elements in the Deque\n" );
  
// Display the Deque elements
var_dump( $deck );
  
// Use copy() function to 
// copy the Deque
$deck_copy = $deck -> copy ();
  
echo ( "\nCopy Deque elements\n" );
  
// Display the Deque elements
var_dump( $deck_copy );
  
?>

输出如下:

Elements in the Deque
object(Ds\Deque)#1 (6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
}

Copy Deque elements
object(Ds\Deque)#2 (6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
}

程式2:

<?php
  
// Declare deque
$deck = new \Ds\Deque([ "geeks" , "for" , "geeks" ]);
  
echo ( "Elements in the Deque\n" );
  
// Display the Deque elements
print_r( $deck );
  
// Use copy() function to 
// copy the Deque
$deck_copy = $deck -> copy ();
  
echo ( "\nCopy Deque elements\n" );
  
// Display the Deque elements
print_r( $deck_copy );
  
?>

输出如下:

Elements in the Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)

Copy Deque elements
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)

参考: http://php.net/manual/en/ds-deque.copy.php


木子山

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