* @copyright * @version * @since **//* SplDoublyLinkedList * 方法 SplDoublyLinkedList implements Iterator , ArrayAccess , Countable {     public __construct ( void )         public void add ( mixed $index , mixed $newval ) 在指定的索引位置插入值         public mixed bottom ( void ) 查看开始位置的节点         public mixed top ( void ) 查看结束位置的节点         public int count ( void ) 返回所有的元素的数量         public void rewind ( void ) 倒回迭代器的开始         public mixed current ( void ) 返回当前节点的信息         public mixed key ( void ) 返回当前节点的索引         public void setIteratorMode ( int $mode ) 设置迭代的模式         public int getIteratorMode ( void ) 返回迭代的模式         public bool isEmpty ( void ) 检查该双向列表是否是空的         public void next ( void ) 移动到下一个节点         public void prev ( void ) 移动到上一个节点         public bool offsetExists ( mixed $index )         public mixed offsetGet ( mixed $index )         public void offsetSet ( mixed $index , mixed $newval )         public void offsetUnset ( mixed $index )         public mixed pop ( void ) 从双向列表的末尾弹出一个节点         public void push ( mixed $value ) 向双向列表的末尾推入一个元素         public mixed shift ( void ) 从双向列表的头部弹出一个节点         public void unshift ( mixed $value ) 向双向列表的头部插入一个元素         public string serialize ( void )         public void unserialize ( string $serialized )         public bool valid ( void ) 检查双向列表是否有更多的节点} */$SplDoublyLinkedList = new SplDoublyLinkedList();$mysqli = new mysqli('114.55.104.117', 'db_writer', 'ka_32^%*ko', 'db_community');if($mysqli->connect_errno)    exit('Mysql connect error ' . $mysqli->connect_error);$query  = "show tables like '%zhs_user_timeline_%'";$result = $mysqli->query($query);if(!$result)    exit('error ' . $mysqli->error);while($row = $result->fetch_row()){    //list($arData[]) = array_values($row);    $SplDoublyLinkedList->push($row[0]);    }$result->close();$mysqli->close();echo count($SplDoublyLinkedList), PHP_EOL;$SplDoublyLinkedList->rewind();while($SplDoublyLinkedList->valid()){    var_export($SplDoublyLinkedList->shift());    echo PHP_EOL;    echo count($SplDoublyLinkedList), PHP_EOL;    $SplDoublyLinkedList->next();}echo count($SplDoublyLinkedList);?>