树状循环输出，好几天了也没做好，请大神帮帮参考下

<select><option value="8">111111</option><option value="13">*121212</option><option value="14">*32323232</option><option value="9">22222222</option><option value="10">*333333</option><option value="11">**44444444</option><option value="12">***555555</option><option value="17">***werwerwer</option><option value="19">**6565656</option><option value="15">*23232323</option><option value="16">**324234234</option></select>

$class  =  $this->tclass->get_all_class($this->tbname);        $json_class = Array();			        $json_class2 = array();        foreach ($class as $key=>$value) {						  if($class[$key]['sonclass']) //如果有子分类            {                $json_class[$key]['id'] = $value['classid'];                $json_class[$key]['text'] = $value['classname'];                $son_arr = $this->tclass->get_son_class($value['sonclass'],$this->tbname);                foreach ($son_arr as $k=>$v) {                   $json_class1[$k]['id'] = $v['classid'];                   $json_class1[$k]['text'] = $v['classname'];				   				                   }               $json_class[$key]['children'] = $json_class1;            }        }