Ds\Deque::unshift

Adds values to the front of the deque

&reftitle.description; public `void` `Ds\Deque::unshift` `mixed` `values`

Adds values to the front of the deque, moving all the current values forward to make room for the new values.

&reftitle.parameters;

`values`

- The values to add to the front of the deque.

  Multiple values will be added in the same order that they are passed.

&reftitle.returnvalues;

&return.void;

&reftitle.examples;

### `Ds\Deque::unshift` example

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

    $deque->unshift("a");
    $deque->unshift("b", "c");

    print_r($deque);
    ?>

&example.outputs.similar;

    Ds\Deque Object
    (
        [0] => b
        [1] => c
        [2] => a
        [3] => 1
        [4] => 2
        [5] => 3
    )