A PHP class tree (supports unlimited classification)

Recently, there have been a lot of questions asked about infinite classification trees, so I was happy to write one myself. I just finished it. You can use it to see how to implement it faster and simpler. Post your tree as well (required) Only query the database once)

This is a class tree with a classification list, supporting unlimited classifications

A classification can have both "classification containing subclasses" and "Final classification";

The only advantage is that ***** only needs to perform a database ***** query once.

It doesn’t look very good It looks good, but it can be customized and modified. You can define your own css and add it

Caching has not been done yet, you can make it up yourself

The directory structure of the example below is like this.
¦--Catagory.php

¦--images----tree.jsp

¦--images----treeopen.gif

¦--images----treeclose.gif

¦--images----line.gif

/****************tree.jsp********************/
function expand(id){
           node = document.all('node'+id);
           if(node.style.display==''){
                       node.style.display = 'none';
                       document.images('img'+id).src = imgopen;
           }else{
                       node.style.display = '';
                       document.images('img'+id).src = imgclose;
           }
}

/****************Catagory.php********************/

define('CATAGORY_TREE_EXPEND_NONE',0);
define('CATAGORY_TREE_EXPEND_ALL',1);

class Catagory{
//Basic classification data
var $treeData = array();
//Classified hierarchical structure array, with the id value of the category as the key of the array
var $treePList = array();
//Relationship between self-categorization and parent class
var $treeCList = array();
/*
/* This is a template for large classification
*
* __id__ The number of the category
The name of the category
The name of the category $imgOpen or $imgClose
* __open__ Whether the category is currently expanded
* __inner__ Sub-category Shown location * The style can be modified according to your own needs, but existing elements cannot be deleted
*/
var $blockTpl = '

                                                                                                                                                                                               ';
/*
        * This is a template for small categories                                                                                          5 " height="15">__name__
';
                                                                                           ?id=__id__"> ;__name__';
var $js = "images/tree.js";

var $imgOpen = 'images /treeopen.gif';
var $imgClose = 'images/treeclose.gif';
var $imgLine = 'images/line.gif';

var $cachFile = '';
var $expand = 0;

var $result = array();
       var $treeStr = '';
       var $currentStr = '';
       /*
         * 用来初始化，传入分类数据
         *
         *param $data array()
       */
           function Catagory(&$data){
               $this->_init($data);
       }

       function _init($tmpData){
               $plevel = $clevel = $treeData = array(); foreach($tmpData as $value){
                           $treeData[$value['id']] = $value;
                           $plevel[$value['pid']][$value['id']] = 'END';
                       $clevel[$value['id']] = $value['pid'];
                   }
               $this->treeData = &$treeData;
               $this->treePList = &$plevel;
               $this->treeCList = &$clevel;
           }
       /*
         * 解析分类列表
         *
         *param $cataId int 要解析的主分类的编号
       */
       function parseNode($cataId=0){
               $this->result = $this->treePList[$cataId];
               if($this->result==null) die("Catagory id error");
                   $this->treeStr =    $this->_doNode($this->result);
               $this->treeStr .= $this->_jsParse();
       }

           function &_doNode(&$result){
                   $nstr = $estr = '';
                   foreach($result as $key=>$value){
                           if(isset($this->treePList[$key])){
                                   $result[$key] = $this->treePList[$key];
                                   $inner = $this->_doNode($result[$key]);
                               $nstr .= $this->_parseNodeTpl($key, $inner);
                           }else{
                               $estr .= $this->_parseElementTpl($key);
                       }
               }
               return $nstr.$estr;
           }

       function &_parseNodeTpl($cataId, $inner){
               $data = $this->treeData[$cataId];
               $str = preg_replace(' ¦__id__ ¦', $data['id'], $this->blockTpl);
               $str = preg_replace(' ¦__name__ ¦', $data['name'], $str);
               $str = preg_replace(' ¦__image__ ¦', ($this->expand? $this->imgClose:$this->imgOpen), $str);
               $str = preg_replace(' ¦__open__ ¦', ($this->expand?'':'none'), $str);
               $str = preg_replace(' ¦__inner__ ¦', $inner, $str);
               return $str;
       }

       function _parseElementTpl($cataId){
               $data = $this->treeData[$cataId];
               $str = preg_replace(' ¦__id__ ¦', $data['id'], $this->elementTpl);
               $str = preg_replace(' ¦__name__ ¦', $data['name'], $str);
               $str = preg_replace(' ¦__image__ ¦', $this->imgLine, $str);
               return $str;
       } function _jsParse(){

& lt;/script & gt; & lt; script src = "$ this- & gt; js" language = "javascript" & gt; & lt;/script & gt; "
Return $ str; 🎜>}
/ *
     * Expand category $cataId                                                  $str = '' ;
                                                                    . ) ;
}
$this->currentStr = &$str;

function _parseCurrentTpl($cataId){
$data = $this->treeData [$cataId];
$ Str = Preg_replace ('¦__ID__ ¦', $ Data ['ID'], $ this-& gt; Currenttpl); '], $str);
return $str;
}
                                                                                                               ){
                                                                                                                                                                               = "expand($ cataid); "
WHILE (isset ($ this-& gt; treeClist [$ cataid]) && $ this- & gt; timeclist [$ cataid]! = 0) {
$ str. .$this->treeCList[$cataId].");";
                                              ->treeStr .= " ";
                                                                          return $this->currentStr;                                    return $this->treeStr;
                                                                                  $this->elementTpl = $ elementTpl;
$this->currentTpl = $currentTpl;
$this->js = $js;
}

function setImage($open , $close, $line) {
$this->imgOpen = $open;
$this->imgClose = $close;
$this->imgLine = $line;
}

function setExpend($expand){


//分类的基础数据的样子如下:
$data = array(array('id'=>1, 'name'=>'name1', 'pid'=>0, 'order'=>1),
                           array('id'=>2, 'name'=>'name2', 'pid'=>1, 'order'=>1),
                           array('id'=>3, 'name'=>'name3', 'pid'=>0, 'order'=>1),
                           array('id'=>4, 'name'=>'name4', 'pid'=>3, 'order'=>1),
                           array('id'=>5, 'name'=>'name5', 'pid'=>6, 'order'=>1),
                           array('id'=>6, 'name'=>'name6', 'pid'=>2, 'order'=>1),
                           array('id'=>7, 'name'=>'name7', 'pid'=>6, 'order'=>1),
                           array('id'=>8, 'name'=>'name8', 'pid'=>3, 'order'=>1),
                           array('id'=>9, 'name'=>'name9', 'pid'=>6, 'order'=>1),
                           array('id'=>10, 'name'=>'name10', 'pid'=>0, 'order'=>1),
                           array('id'=>11, 'name'=>'name11', 'pid'=>10, 'order'=>1),
                          array('id'=>12, 'name'=>'name12', 'pid'=>10, 'order'=>1),
                          array('id'=>13, 'name'=>'name13', 'pid'=>10, 'order'=>1),
                          array('id'=>14, 'name'=>'name14', 'pid'=>12, 'order'=>1),
                          array('id'=>15, 'name'=>'name15', 'pid'=>12, 'order'=>4),
                  ); echo "";
$tree = new Catagory($data);
echo "

下面是当前分类的类树

";
//$tree->setExpend(1);
$tree->parseNode(0);
//$tree->parseNode(1);
//$tree->expand(9);
echo $tree->getTreeStr();

echo "

下面是当前分类(分类的编号是9)的路径

";
$tree->parseCurrent(9);
echo $tree->getCurrentStr();

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