📜  PHP | Ds\Map union()函数

📅  最后修改于: 2022-05-13 01:56:52.548000             🧑  作者: Mango

PHP | Ds\Map union()函数

Ds\Map::union()函数是PHP中的一个内置函数,用于创建包含两个地图并集的新地图。

句法:

Ds\Map Ds\Map::union( $map )

参数:此函数接受单个参数$map ,该参数用于保存实例的另一个映射以与当前实例组合。

返回值:它返回一个包含两个映射并集的映射。

下面的程序说明了PHP中的 Ds\Map::union()函数:

方案一:

 1, "b" => 3, "c" => 5]); 
  
// Declare another new map
$b = new \Ds\Map(["a" => 2, "c" => 3, "d" => 6]); 
  
// Print the Union of two map
echo("Union of both map is: \n"); 
  
print_r($a->union($b));
  
?>
输出:
Union of both map is: 
Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => a
            [value] => 2
        )

    [1] => Ds\Pair Object
        (
            [key] => b
            [value] => 3
        )

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

    [3] => Ds\Pair Object
        (
            [key] => d
            [value] => 6
        )

)

方案二:

 "Geeks", "b" => "for", "c" => "Geeks"]); 
  
// Declare another new map
$b = new \Ds\Map(["b" => "Computer", "e" => "Science", "f" => "Portal"]); 
  
// Print the union of two map
echo("Union of both map is: \n"); 
  
print_r($a->union($b));
  
?>
输出:
Union of both map is: 
Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => a
            [value] => Geeks
        )

    [1] => Ds\Pair Object
        (
            [key] => b
            [value] => Computer
        )

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

    [3] => Ds\Pair Object
        (
            [key] => e
            [value] => Science
        )

    [4] => Ds\Pair Object
        (
            [key] => f
            [value] => Portal
        )

)

参考: https://www. PHP.net/manual/en/ds-map.union。 PHP