PHP Ds\Map copy()用法及代碼示例

PHP的Ds \ Map::copy()函數用於獲取指定Map實例的淺拷貝。它會以與指定Map實例相同的順序返回包含所有鍵值對的Map實例的副本。

用法:

Ds\Map public Ds\Map::copy ( )

參數：該函數不接受任何參數。

返回值：它返回指定Map實例的淺拷貝。

以下示例程序旨在說明Ds \ Map::copy()函數：

程序1:

<?php 
// PHP program to illustrate copy() function 
  
$map = new \Ds\Map([1 => "Geeks", 2 => "for",  
                                3 => "Geeks"]); 
  
print_r($map->copy()); 
  
?>

輸出：

Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => 1
            [value] => Geeks
        )

    [1] => Ds\Pair Object
        (
            [key] => 2
            [value] => for
        )

    [2] => Ds\Pair Object
        (
            [key] => 3
            [value] => Geeks
        )

)

程序2:

<?php 
// PHP program to illustrate copy() function 
  
$map = new \Ds\Map(["first" => "Geeks", "second" => "for",  
                                "third" => "Geeks"]); 
  
print_r($map->copy()); 
  
?>

輸出：

Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => first
            [value] => Geeks
        )

    [1] => Ds\Pair Object
        (
            [key] => second
            [value] => for
        )

    [2] => Ds\Pair Object
        (
            [key] => third
            [value] => Geeks
        )

)

參考：http://php.net/manual/en/ds-map.copy.php