php通用的树型类创建无限级树型菜单

生成树型结构所需要的2维数组,var $arr = array()数组格式如下：

array(
1 => array('id'=>'1','parentID'=>0,'name'=>'一级栏目一'),
2 => array('id'=>'2','parentID'=>0,'name'=>'一级栏目二'),
3 => array('id'=>'3','parentID'=>1,'name'=>'二级栏目一'),
4 => array('id'=>'4','parentID'=>1,'name'=>'二级栏目二'),
5 => array('id'=>'5','parentID'=>2,'name'=>'二级栏目三'),
6 => array('id'=>'6','parentID'=>3,'name'=>'三级栏目一'),
7 => array('id'=>'7','parentID'=>3,'name'=>'三级栏目二')
)

生成树型结构所需修饰符号，可以换成图片：

var $icon = array('│','├','└');var $ret = '';var $html='';

构造函数，初始化类：

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

得到父级数组函数：

function get_parent($myid)    {        $newarr = array();        if(!isset($this->arr[$myid])) return false;        $pid = $this->arr[$myid]['parentID'];        $pid = $this->arr[$pid]['parentID'];        if(is_array($this->arr))        {            foreach($this->arr as $id => $a)            {                if($a['parentID'] == $pid) $newarr[$id] = $a;            }        }        return $newarr;    }

得到子级数组函数：

function get_child($myid)    {        $a = $newarr = array();        if(is_array($this->arr))        {            foreach($this->arr as $id => $a)            {                if(@$a['parentID'] == $myid) {                    $newarr[$id] = $a;                }            }        }        return $newarr ? $newarr : false;    }

得到当前位置数组：

function get_pos($myid,&$newarr)    {        $a = array();        if(!isset($this->arr[$myid])) return false;        $newarr[] = $this->arr[$myid];        $pid = $this->arr[$myid]['parentID'];        if(isset($this->arr[$pid]))        {            $this->get_pos($pid,$newarr);        }        if(is_array($newarr))        {            krsort($newarr);            foreach($newarr as $v)            {                $a[$v['id']] = $v;            }        }        return $a;    }

得到树型结构：

　　$myid 表示获得这个ID下的所有子级;$str 生成树形结构基本代码, 例如: "<option value=\$id \$select>\$spacer\$name</option>";$sid 被选中的ID, 比如在做树形下拉框的时候需要用到;函数如下：

function get_tree($myid, $str, $sid = 0, $adds = '', $str_group = '')    {        $number=1;        $child = $this->get_child($myid);        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 : '';                $selected = $a["id"]==$sid ? 'selected' : '';                @extract($a);                @$parentID == 0 && $str_group ? eval("\$nstr = \"$str_group\";") : eval("\$nstr = \"$str\";");                $this->ret .= $nstr;                $this->get_tree($id, $str, $sid, $adds.$k.'  ',$str_group);                $number++;            }        }        return $this->ret;    }

同上一方法类似,但允许多选：

function get_tree_multi($myid, $str, $sid = 0, $adds = '')    {        $number=1;        $child = $this->get_child($myid);        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 : '';                $selected = $this->have($sid,$id) ? 'selected' : '';                @extract($a);                eval("\$nstr = \"$str\";");                $this->ret .= $nstr;                $this->get_tree_multi($id, $str, $sid, $adds.$k.' ');                $number++;            }        }        return $this->ret;    }     function have($list,$item){        return(strpos(',,'.$list.',',','.$item.','));    }

格式化数组函数：

function getArray($myid=0, $sid=0, $adds='')    {        $number=1;        $child = $this->get_child($myid);        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);                $a['name'] = $spacer.' '.$a['name'];                $this->ret[$a['id']] = $a;                $fd = $adds.$k.' ';                $this->getArray($id, $sid, $fd);                $number++;            }        }         return $this->ret;    }

将数组转化为树形数组函数：

public function arrToTree($data,$pid){        $tree = array();        foreach($data as $k => $v){            if($v['parentID'] == $pid){                $v['parentID'] = $this->arrToTree($data,$v['id']);                $tree[] = $v;            }        }           return $tree;    }

左边菜单栏输出函数：

public function outToHtml($tree){        $html = '';        foreach($tree as $t){            if(empty($t['parentID'])){                $html .= "<li><a href=\"javascript:\" onclick=\"$.bringBack({id:'$t[id]',name:'$t[name]'})\">$t[name]</a></li>";            }else{                $html .='<li><a href="javascript:">'.$t['name'].'</a><ul>';                $html .= $this->outToHtml($t['parentID']);                $html  = $html.'</ul></li>';            }        }         return $html;    }

实例化调用tree类格式如下：

 $tree = new tree; $tree->tree($categorys); echo "<select name=\"f_id\" >"; echo "<option value='0' >添加一级分类</option>"; //get_tree(父ID,格式化字符窜,默认选中哪个分类,修饰前缀,父级分类样式) 前面两个必填，后面三个可选 $data .= $tree->get_tree(0, "<option value='\$id' \$selected>\$spacer\$name</option>\n", 0, '' , "<optgroup label='\$name'></optgroup>"); echo $data; echo "</select>";

tree完整类下载地址：http://pan.baidu.com/s/1gfai1qj

密码：sah8