PHP Manual: Joins all values together as a string

public string Ds\Deque::join(string $glue = ?)

Joins all values together as a string using an optional separator between each value.

All values of the deque joined together as a string.

Example #1 Ds\Deque::join example using a separator string

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

var_dump($deque->join("|"));
?>

The above example will output something similar to:

string(11) "a|b|c|1|2|3"

Example #2 Ds\Deque::join example without a separator string

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

var_dump($deque->join());
?>

The above example will output something similar to:

string(11) "abc123"