Converts the set to an array.
Note:
Casting to an array is not supported yet.
此函数没有参数。
An array containing all the values in the same order as the set.
Example #1 Ds\Set::toArray() example
<?php
$set = new \Ds\Set([1, 2, 3]);
var_dump($set->toArray());
?>
以上例程的输出类似于：
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}