(PECL ds >= 1.0.0)
Ds\Set::__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.
示例 #1 Ds\Set::__construct() example
<?php
$set = new \Ds\Set();
var_dump($set);
$set = new \Ds\Set([1, 2, 3]);
var_dump($set);
?>以上示例的输出类似于:
object(Ds\Set)#1 (0) {
}
object(Ds\Set)#2 (3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}
