Returns a shallow copy of the map

# Ds\Map::copy

(PECL ds >= 1.0.0)

Ds\Map::copy — Returns a shallow copy of the map

### 说明

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

Returns a shallow copy of the map.

### 参数

此函数没有参数。

### 返回值

Returns a shallow copy of the map.

### 示例

示例 #1 Ds\Map::copy() example

    <?php
    $map = new \Ds\Map([
        "a" => 1,
        "b" => 2,
        "c" => 3,
    ]);

    print_r($map->copy());
    ?>

以上示例的输出类似于：

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

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

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

    )

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