刚刚学习php，那位高手可以给个利用php实现链表和二叉树的代码

Question

请高手给个链表和二叉树相关可执行代码
链表的数据结构：
class Lnode
{
  private $data;
  private $next; 
}二叉树的数据结构：
class Tnode
{
  private $data;
  private $lchild;
  private $rchild;
}谢谢！

Answer 1

PHP array 可以模拟很多种结构。 

Answer 2

<?php
class Lnode
{
  public $data;
  public $next;  
}class Lists {
  private $root;
  function Lists() {
    $this->root = new Lnode;
  }
  function append($v) {
    $sp =& $this->root;
    while(! empty($sp)) $sp =& $sp->next;
    $sp = new Lnode;
    $sp->data = $v;
  } 
  function delete($v) {
    $sp =& $this->root;
    while(! empty($sp) && $sp->next->data != $v) $sp =& $sp->next;
    if($sp) $sp->next = $sp->next->next;
  }    
}$p = new Lists;
$p->append('A');
$p->append('B');
$p->append('C');
print_r($p);
$p->delete('B');
print_r($p);Lists Object
(
    [root:private] => Lnode Object
        (
            [data] => 
            [next] => Lnode Object
                (
                    [data] => A
                    [next] => Lnode Object
                        (
                            [data] => B
                            [next] => Lnode Object
                                (
                                    [data] => C
                                    [next] => 
                                )                        )                )        ))
Lists Object
(
    [root:private] => Lnode Object
        (
            [data] => 
            [next] => Lnode Object
                (
                    [data] => A
                    [next] => Lnode Object
                        (
                            [data] => C
                            [next] => 
                        )                )        ))