理论上实现真正意义的无限级别菜单

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".$i." src="/Files/BeyondPic/2005-12/19/0512190657505020.gif"\" onclick=outliner() style=\"cursor:hand\" child=\"".$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".$i." src="/Files/BeyondPic/2005-12/19/0512190657505020.gif"\" onclick=outliner() style=\"cursor:hand\" child=\"".$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="/Files/BeyondPic/2005-12/19/0512190657505020.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");
        }    
}

原文转自：http://www.ltesting.net