Returns a shallow copy of the set

# Ds\Set::copy

(PECL ds >= 1.0.0)

Ds\Set::copy — Returns a shallow copy of the set

### 说明

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

Returns a shallow copy of the set.

### 参数

此函数没有参数。

### 返回值

Returns a shallow copy of the set.

### 示例

示例 #1 Ds\Set::copy() example

    <?php
    $a = new \Ds\Set([1, 2, 3]);
    $b = $a->copy();

    // Updating the copy doesn't affect the original
    $b->add(4);

    print_r($a);
    print_r($b);
    ?>

以上示例的输出类似于：

    Ds\Set Object
    (
        [0] => 1
        [1] => 2
        [2] => 3
    )
    Ds\Set Object
    (
        [0] => 1
        [1] => 2
        [2] => 3
        [3] => 4
    )

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