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(PHP 5 >= 5.3.0)
SplDoublyLinkedList::__construct — Constructs a new doubly linked list
This constructs a new empty doubly linked list.
此函数没有参数。
没有返回值。
Example #1 SplDoublyLinkedList::__construct() example
  <?php
$dll  = new  SplDoublyLinkedList ();
 $dll -> push ( 2 );
 $dll -> push ( 3 );
 $dll -> unshift ( 5 );
 var_dump ( $dll );
 ?>   以上例程会输出:
object(SplDoublyLinkedList)#1 (2) {
  ["flags":"SplDoublyLinkedList":private]=>
  int(0)
  ["dllist":"SplDoublyLinkedList":private]=>
  array(3) {
    [0]=>
    int(5)
    [1]=>
    int(2)
    [2]=>
    int(3)
  }
}