www.zfire.com/Ainaphp/Lib/ORG/Tree.class.php

<?php
class Tree extends Think {

	public $arr = array();
	public $icon = array('│','├','└');
	public $nbsp = "&nbsp;";
	public $ret = '';
	public $level = 0;

    public function __construct($arr=array()) {
         $this->arr = $arr;
	     $this->ret = '';
	     return is_array($arr);
    }

	public function getchild($bid){
		$a = $newarr = array();
		if(is_array($this->arr)){
			foreach($this->arr as $id => $a){
				if($a['parentid'] == $bid) $newarr[$id] = $a;
			}
		}
		return $newarr ? $newarr : false;
	}

	function get_tree($bid, $str, $sid = 0, $adds = '', $strgroup = ''){
		$number=1;
		$child = $this->getchild($bid);
		if(is_array($child)){
		    $total = count($child);
			foreach($child as $id=>$a){
				$j=$k='';
				if($number==$total){
					$j .= $this->icon[2];
				}else{
					$j .= $this->icon[1];
					$k = $adds ? $this->icon[0] : '';
				}
				$spacer = $adds ? $adds.$j : '';

				@extract($a);
				if(empty($a['selected'])){$selected = $id==$sid ? 'selected' : '';}
				$parentid == 0 && $strgroup ? eval("\$newstr = \"$strgroup\";") : eval("\$newstr = \"$str\";");
				$this->ret .= $newstr;
				$nbsp = $this->nbsp;
				$this->get_tree($id, $str, $sid, $adds.$k.$nbsp,$strgroup);
				$number++;
			}
		}
		return $this->ret;
	}

	function get_nav($bid,$maxlevel,$effected_id='navlist',$style='filetree ' ,$homefont='',$recursion=FALSE ,$child='',$enhomefont='',$lang='') {

		if($enhomefont) $indexen =  '<em>'.$enhomefont.'</em>';
		if($homefont) $homefont='<li id="nav_0"><span class="fl_ico"></span><a href="'.URL().'" title="'.L(HOME_FONT).'"><span class="fl">'.L(HOME_FONT).'</span>'.$indexen.'</a></li>';

		$number=1;
		if(!$child) $child = $this->getchild($bid);
		$total = count($child);
		$effected = $effected_id ?  ' id="'.$effected_id.'_box"' : '';
		$class=  $style? ' class="'.$style.'"' : '';
        if(!$recursion)	$this->ret .='<ul'.$effected.$class.'>'.$homefont;
        foreach($child as $id=>$a) {
        	@extract($a);
			if(!$this->level){
				$this->level= $level ? $level+$maxlevel-1 : $maxlevel;
			}

			$ischild =$this->getchild($id);
			$foldertype =  $ischild ? 'folder' : 'file';
        	$floder_status = ' id="'.$effected_id.'_'.$id.'"';
			$first = $number==1 ?   'first ' : '';
			$floder_status .=  $number==$total ?  ' class="foot '.$foldertype.'"' :  ' class="'.$first.$foldertype.'"';
			$this->ret .= $recursion ? '<ul><li'.$floder_status.'>' : '<li'.$floder_status.'>';
            $recursion = FALSE;
			if($enhomefont){
				$enzm = $enname ? '<em>'.$enname.'</em>' :  '<em>'.$catdir.'</em>';
			}
            if($ischild && $level < $this->level){
				$this->ret .= '<span class="fd_ico"></span><a href="'.$url.'" title="'.$catname.'"><span class="fd">'.$catname.'</span>'.$enzm.'</a>';
                $this->get_nav($id,$maxlevel,$effected_id,$style,'',TRUE,$ischild,$enhomefont,$lang);
            } else {
			   $this->ret .= '<span class="fl_ico"></span><a href="'.$url.'" title="'.$catname.'"><span class="fl">'.$catname.'</span>'.$enzm.'</a>';
            }
           $this->ret .=$recursion ? '</li></ul>': '</li>';
		   $number++;
        }
        if(!$recursion)  $this->ret .='</ul>';
        return $this->ret;
    }
}
?>