Returns the sum of all values in the deque

# Ds\Deque::sum

(PECL ds >= 1.0.0)

Ds\Deque::sum — Returns the sum of all values in the deque

### 说明

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

Returns the sum of all values in the deque.

> 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 deque as either a float or int depending on the values in the deque.

### 示例

示例 #1 Ds\Deque::sum() integer example

    <?php
    $deque = new \Ds\Deque([1, 2, 3]);
    var_dump($deque->sum());
    ?>

以上示例的输出类似于：

    int(6)

示例 #2 Ds\Deque::sum() float example

    <?php
    $deque = new \Ds\Deque([1, 2.5, 3]);
    var_dump($deque->sum());
    ?>

以上示例的输出类似于：

    float(6.5)

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