(PECL ds >= 1.0.0)
Ds\Stack::copy — Returns a shallow copy of the stack
此函数没有参数。
Returns a shallow copy of the stack.
示例 #1 Ds\Stack::copy() example
<?php
$a = new \Ds\Stack([1, 2, 3]);
$b = $a->copy();
// Updating the copy doesn't affect the original
$b->push(4);
print_r($a);
print_r($b);
?>以上示例的输出类似于：
Ds\Stack Object ( [0] => 3 [1] => 2 [2] => 1 ) Ds\Stack Object ( [0] => 4 [1] => 3 [2] => 2 [3] => 1 )