id = $id;        $this->name = $name;    }    static public function show ($head)    {        $cur = $head;        while ($cur->next) {            echo $cur->next->id,'###',$cur->next->name,'
';            $cur = $cur->next;        }        echo '
     
';    }    //尾插法    static public function push ($head, $node)    {        $cur = $head;        while (NULL != $cur->next) {            $cur = $cur->next;        }        $cur->next  = $node;        return $head;    }    static public function insert($head, $node)    {        $cur = $head;        while (NULL != $cur->next) {            if ($cur->next->id > $node->id) {                break;            }            $cur = $cur->next;        }        $node->next = $cur->next;        $cur->next  = $node;        return $head;    }    static public function edit($head, $node)    {        $cur = $head;        while (NULL != $cur->next) {            if ($cur->next->id == $node->id) {                break;            }            $cur = $cur->next;        }        $cur->next->name = $node->name;        return $head;            }    static public function pop ($head, $node)    {        $cur = $head;        while (NULL != $cur->next) {            if ($cur->next == $node) {                break;            }            $cur = $cur->next;        }        $cur->next = $node->next;        return $head;                }}$team = new Demo();$node1 = new Demo(1, '唐三藏');Demo::push($team, $node1);$node1->name = '唐僧';Demo::show($team);// Demo::show($team);$node2 = new Demo(2, '孙悟空');Demo::insert($team, $node2);// Demo::show($team);$node3 = new Demo(5, '白龙马');Demo::push($team, $node3);// Demo::show($team);$node4 = new Demo(3, '猪八戒');Demo::insert($team, $node4);// Demo::show($team);$node5 = new Demo(4, '沙和尚');Demo::insert($team, $node5);// Demo::show($team);$node4->name = '猪悟能';//php对象传引用，所以Demo::edit没有必要// unset($node4);// $node4 = new Demo(3, '猪悟能');// Demo::edit($team, $node4);Demo::pop($team, $node1);Demo::show($team);