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

### Description

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

Returns the sum of all values in the deque.

> Note:

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

### Parameters

This function has no parameters.

### Return Values

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

### Examples

Example #1 Ds\Deque::sum() integer example

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

The above example will output something similar to:

    int(6)

Example #2 Ds\Deque::sum() float example

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

The above example will output something similar to:

    float(6.5)

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