很久没用php了，为了加深数据结构的基本知识（为考试准备），练习一下基本的算法，当然还是为了以后使用php做菜单的时候免得麻烦。
算法：数据结构中的最基本的树与二叉树的转换
大家凑合着看吧！因为只是为了熟悉一下算法，没有做具体的测试，同时对数据库的操作没有封装成类，大家如果需要可以自行修改或者和我联系！
your data must save like this:
id,topic,child_l,parent,child_r,content
file name:
show.inc.php
codes:
==================================================
<?
class shows{
var $items;
var $the_stack;
var $count=0;
function find($l_value) {
for($j=1;$j<=$this->items["info_all"];$j++) {
if($l_value==$this->items["d_id][$j]"])
{ return($j);exit; }
}
}
function m_l_r_list($i) {
if(($this->items["f_node][$i]"]==0)&&($this->items["r_node][$i]"]==0)&&($this->items["l_node][$i]"]!=-1))
{//if it is root node!!!
echo "<table><tr><td>";
echo "<img id=image".$i." src=\"c.gif\" onclick=outliner() style=\"cursor:hand\" child=\"".$i."all\" name=\"name_".$i."all\">";
echo "<a href=\"".$this->pages_0($this->items["d_id][$i]"])."?d_id=".$this->items["d_id][$i]"]."\" target=\"rightframe\">".$this->items["node_value][$i]"]."</a>";
echo " <a href=addnode.php?id=".$this->items["d_id][$i]"]." target=\"rightframe\"><font size=2 color=red>add</font></a>";
echo "</td></tr></table>";
echo "<div class=collapsed id=".$i."all>";
$i=$this->find($this->items["l_node][$i]"]);
$this->count=$this->count+2;
$this->m_l_r_list($i);
exit;
}
if(($this->items["f_node][$i]"]==0)&&($this->items["r_node][$i]"]==0)&&($this->items["l_node][$i]"]==-1))
{
exit;
}
if(($this->items["f_node][$i]"]!=0)&&($this->items["r_node][$i]"]!=0)&&($this->items["l_node][$i]"]!=0))
{//if node have left and right child
$current_node=$this->items["d_id][$i]"];
if(($this->items["l_node][$i]"]==-1)&&($this->items["r_node][$i]"]==-1)) {
$i=$this->find($this->items["f_node][$i]"]);
if(($this->items["r_node][$i]"]==$current_node)) {//his parent use right point
$this->items["r_node][$i]"]=-1;
}
if(($this->items["l_node][$i]"]==$current_node)) {//his parent use left point
$this->items["l_node][$i]"]=-1;
}
$this->count=$this->count-2;
$this->m_l_r_list($i);
}//if left child and right child have been visited up to his parent node
if(($this->items["l_node][$i]"]!=-1)&&($this->items["r_node][$i]"]!=-1)) {
echo "<table><tr><td>";
for ($k=0;$k<$this->count;$k++) { echo " ";}
echo "<img id=image".$i." src=\"c.gif\" onclick=outliner() style=\"cursor:hand\" child=\"".$i."all\" name=\"name_".$i."all\">";
echo "<a href=\"main.php?d_id=".$this->items["d_id][$i]"]."\" target=\"rightframe\">".$this->items["node_value][$i]"]."</a>";
//echo $this->items["node_value][$i]"];
echo " <a href=addnode.php?id=".$this->items["d_id][$i]"]." target=\"rightframe\"><font size=2 color=red>add</font></a>";
echo " <a href=delnode.php?id=".$this->items["d_id][$i]"]."><font size=2 color=red>del</font></a>";
echo "</td></tr></table>";
echo "<div class=collapsed id=".$i."all>";
$i=$this->find($this->items["l_node][$i]"]);//visite left child node
$this->count=$this->count+2;
$this->m_l_r_list($i);
}//if left child node and right child node have not been visited
if(($this->items["l_node][$i]"]==-1)&&($this->items["r_node][$i]"]!=-1)) {
$i=$this->find($this->items["r_node][$i]"]);//visite right child node
$this->m_l_r_list($i);
}//if left child node have been visited and right child node have not been visited
}
if(($this->items["f_node][$i]"]!=0)&&($this->items["r_node][$i]"]==0)&&($this->items["l_node][$i]"]!=0))
{//if node only have left child
$current_node=$this->items["d_id][$i]"];
if($this->items["l_node][$i]"]!=-1) {
echo "<table><tr><td>";
for ($k=0;$k<$this->count;$k++) { echo " ";}
echo "<img id=image".$i." src=\"c.gif\" onclick=outliner() style=\"cursor:hand\" child=\"".$i."all\" name=\"name_".$i."all\">";
echo "<a href=\"main.php?d_id=".$this->items["d_id][$i]"]."\" target=\"rightframe\">".$this->items["node_value][$i]"]."</a>";
//echo $this->items["node_value][$i]"];
echo " <a href=addnode.php?id=".$this->items["d_id][$i]"]." target=\"rightframe\"><font size=2 color=red>add</font></a>";
echo " <a href=delnode.php?id=".$this->items["d_id][$i]"]."><font size=2 color=red>del</font></a>";
echo "</td></tr></table>";
echo "<div class=collapsed id=".$i."all>";
$i=$this->find($this->items["l_node][$i]"]);//visite left child node
$this->count=$this->count+2;
$this->m_l_r_list($i);
exit;
}//if his left child node have not been visited
if($this->items["l_node][$i]"]==-1) {
echo "</div>";
$i=$this->find($this->items["f_node][$i]"]);
if(($this->items["r_node][$i]"]==$current_node)) {//his parent use right point
$this->items["r_node][$i]"]=-1;
}
if(($this->items["l_node][$i]"]==$current_node)) {//his parent use left point
$this->items["l_node][$i]"]=-1;
$this->count=$this->count-2;
}
$this->m_l_r_list($i);
exit;
}//if his left child node have been visite,up to his parent node
}
if(($this->items["f_node][$i]"]!=0)&&($this->items["r_node][$i]"]!=0)&&($this->items["l_node][$i]"]==0))
{//if node only have right child
$current_node=$this->items["d_id][$i]"];
$j=$this->find($this->items["f_node][$i]"]);
if($this->items["r_node][$i]"]!=-1) {
echo "<table><tr><td>";
for ($k=0;$k<$this->count;$k++) { echo " ";}
echo "<a href=\"main.php?d_id=".$this->items["d_id][$i]"]."\" target=\"rightframe\">".$this->items["node_value][$i]"]."</a>";
//echo $this->items["node_value][$i]"];
echo " <a href=addnode.php?id=".$this->items["d_id][$i]"]." target=\"rightframe\"><font size=2 color=red>add</font></a>";
echo " <a href=delnode.php?id=".$this->items["d_id][$i]"]."><font size=2 color=red>del</font></a>";
echo "</td></tr></table>";
$i=$this->find($this->items["r_node][$i]"]);//visite right child node
$this->m_l_r_list($i);
exit;
}//if his right child node have not been visited
if($this->items["r_node][$i]"]==-1) {
$i=$this->find($this->items["f_node][$i]"]);
if(($this->items["r_node][$i]"]==$current_node)) {//his parent use right point
$this->items["r_node][$i]"]=-1;
}
if(($this->items["l_node][$i]"]==$current_node)) {//his parent use left point
$this->items["l_node][$i]"]=-1;
$this->count=$this->count-2;
}
$this->m_l_r_list($i);
exit;
}//if his right child node have been visite,up to his parent node
}
if(($this->items["f_node][$i]"]!=0)&&($this->items["l_node][$i]"]==0)&&($this->items["r_node][$i]"]==0))
{//if this node haven't child node,print it and up to his parent
//node his parent left or right child have been visited
$current_node=$this->items["d_id][$i]"];
$j=$i;
$i=$this->find($this->items["f_node][$i]"]);//up to parent
//echo $this->items["l_node][$i]"];
if(($this->items["r_node][$i]"]==$current_node)) {//his parent use right point
echo "<table><tr><td>";
for ($k=0;$k<$this->count;$k++) { echo " ";}
echo "<a href=\"main.php?d_id=".$this->items["d_id][$j]"]."\" target=\"rightframe\">".$this->items["node_value][$j]"]."</a>";
//echo $this->items["node_value][$j]"];
echo " <a href=addnode.php?id=".$this->items["d_id][$j]"]." target=\"rightframe\"><font size=2 color=red>add</font></a>";
echo " <a href=delnode.php?id=".$this->items["d_id][$j]"]."><font size=2 color=red>del</font></a>";
echo "</td></tr></table>";
echo "</div>";
$this->items["r_node][$i]"]=-1;
}
if(($this->items["l_node][$i]"]==$current_node)) {//his parent use left point
echo "<table><tr><td>";
for ($k=0;$k<$this->count;$k++) { echo " ";}
echo "<a href=\"main.php?d_id=".$this->items["d_id][$j]"]."\" target=\"rightframe\">".$this->items["node_value][$j]"]."</a>";
//echo $this->items["node_value][$j]"];
echo " <a href=addnode.php?id=".$this->items["d_id][$j]"]." target=\"rightframe\"><font size=2 color=red>add</font></a>";
echo " <a href=delnode.php?id=".$this->items["d_id][$j]"]."><font size=2 color=red>del</font></a>";
echo "</td></tr></table>";
echo "</div>";
$this->items["l_node][$i]"]=-1;
$this->count=$this->count-2;
}
$this->m_l_r_list($i);
exit;
}
}
function pages_0($d_id){//
include("conn_db.php");
$sql_query="select * from node_page where d_id=$d_id";
$query_db=mysql_query($sql_query,$connect);
$mypage=mysql_fetch_array($query_db);
include("conn_close.php");
if($mypage["d_page"]!='')
{
return $mypage["d_page"];
}
else return "init.php";
}
function pages($d_id){//
include("conn_db.php");
$sql_query="select * from node_page where d_id=$d_id";
$query_db=mysql_query($sql_query,$connect);
$mypage=mysql_fetch_array($query_db);
include("conn_close.php");
return $mypage["d_page"];
}
function showinfo_0($status){//
include("conn_db.php");
$sql_query="select * from department order by d_id";
$query_db=mysql_query($sql_query,$connect);
$info_all=mysql_num_rows($query_db);
$this->items["info_all"]=$info_all;
if($status==1) {//when status=1 show all data gets from database
$mnums=$info_all;
}
if($status==0) {//when status=0 show 6 messages gets from database
$mnums=6;
}
for($i=1;$i<=$mnums;$i++)
{
$messages=mysql_fetch_array($query_db);
$this->items["d_id][$i]"]=$messages["d_id"];
$this->items["f_node][$i]"]=$messages["f_node"];
$this->items["node_value][$i]"]=$messages["node_value"];
$this->items["l_node][$i]"]=$messages["l_node"];
$this->items["r_node][$i]"]=$messages["r_node"];
}
include("conn_close.php");
}
}
