Returns the sum of all values in the map

# Ds\Map::sum

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Ds\Map::sum — Returns the sum of all values in the map

### 说明

public function Ds\Map::sum(): int|float

Returns the sum of all values in the map.

> 注意:

> Arrays and objects are considered equal to zero when calculating the sum.

### 参数

此函数没有参数。

### 返回值

The sum of all the values in the map as either a float or int depending on the values in the map.

### 示例

示例 #1 Ds\Map::sum() integer example

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

以上示例的输出类似于：

    int(6)

示例 #2 Ds\Map::sum() float example

    <?php
    $map = new \Ds\Map(["a" => 1, "b" => 2.5, "c" => 3]);
    var_dump($map->sum());
    ?>

以上示例的输出类似于：

    float(6.5)

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