Returns the first value in the deque

# Ds\Deque::first

(PECL ds >= 1.0.0)

Ds\Deque::first — Returns the first value in the deque

### Description

public Ds\Deque::first(): mixed

Returns the first value in the deque.

### Parameters

This function has no parameters.

### Return Values

The first value in the deque.

### Errors/Exceptions

UnderflowException if empty.

### Examples

Example #1 Ds\Deque::first() example

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

The above example will output something similar to:

    int(1)

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