Ds \ Map::union()函數是PHP中的內置函數,用於創建包含兩個映射的並集的新映射。
用法:
Ds\Map Ds\Map::union( $map )
參數:該函數接受單個參數$map,該參數用於保存實例的其他映射以與當前實例結合。
返回值:它返回一個包含兩個映射的並集的映射。
以下示例程序旨在說明PHP中的Ds \ Map::union()函數:
程序1:
<?php
// Declare a new map
$a = new \Ds\Map(["a" => 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));
?>
輸出:
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 ) )
程序2:
<?php
// Declare a new map
$a = new \Ds\Map(["a" => "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));
?>
輸出:
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 ) )
參考: https://www.php.net/manual/en/ds-map.union.php
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