(PECL ds >= 1.0.0)
Ds\Stack::__construct — Creates a new instance.
    Creates a new instance, using either a traversable
    object or an array for the initial values.
  
valuesA traversable object or an array to use for the initial values.
Example #1 Ds\Stack::__construct() example
<?php
$stack = new \Ds\Stack();
print_r($stack);
$stack = new \Ds\Stack([1, 2, 3]);
print_r($stack);
?>
The above example will output something similar to:
Ds\Stack Object
(
)
Ds\Stack Object
(
    [0] => 3
    [1] => 2
    [2] => 1
)