PHP无限分类封装

<?php/** +------------------------------------------------ * 通用的树型类 +------------------------------------------------ * @author yangyunzhou@foxmail.com +------------------------------------------------ * @date 2010年11月23日10:09:31 +------------------------------------------------ */class Tree{ ??????/** ????+------------------------------------------------ ????* 生成树型结构所需要的2维数组 ????+------------------------------------------------ ????* @author yangyunzhou@foxmail.com ????+------------------------------------------------ ????* @var Array ????*/ ???var $arr = array(); ??????/** ????+------------------------------------------------ ????* 生成树型结构所需修饰符号，可以换成图片 ????+------------------------------------------------ ????* @author yangyunzhou@foxmail.com ????+------------------------------------------------ ????* @var Array ????*/ ???var $icon = array(‘│‘,‘├‘,‘ └‘); ??????/** ???* @access private ???*/ ???var $ret = ‘‘; ??????/** ???* 构造函数，初始化类 ???* @param array 2维数组，例如： ???* array( ???* ?????1 => array(‘id‘=>‘1‘,‘parentid‘=>0,‘name‘=>‘一级栏目一‘), ???* ?????2 => array(‘id‘=>‘2‘,‘parentid‘=>0,‘name‘=>‘一级栏目二‘), ???* ?????3 => array(‘id‘=>‘3‘,‘parentid‘=>1,‘name‘=>‘二级栏目一‘), ???* ?????4 => array(‘id‘=>‘4‘,‘parentid‘=>1,‘name‘=>‘二级栏目二‘), ???* ?????5 => array(‘id‘=>‘5‘,‘parentid‘=>2,‘name‘=>‘二级栏目三‘), ???* ?????6 => array(‘id‘=>‘6‘,‘parentid‘=>3,‘name‘=>‘三级栏目一‘), ???* ?????7 => array(‘id‘=>‘7‘,‘parentid‘=>3,‘name‘=>‘三级栏目二‘) ???* ?????) ???*/ ???function tree($arr=array()) ???{ ??????$this->arr = $arr; ??????$this->ret = ‘‘; ??????return is_array($arr); ???} ??????/** ???* 得到父级数组 ???* @param int ???* @return array ???*/ ???function get_parent($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 $newarr; ???} ??????/** ???* 得到子级数组 ???* @param int ???* @return array ???*/ ???function get_child($myid) ???{ ???????$a = $newarr = array(); ???????if(is_array($this->arr)) ???????{ ???????????foreach($this->arr as $id => $a) ???????????{ ???????????????if($a[‘parentid‘] == $myid) $newarr[$id] = $a; ???????????} ???????} ???????return $newarr ? $newarr : false; ???} ??????/** ???* 得到当前位置数组 ???* @param int ???* @return array ???*/ ???function get_pos($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 ????* ------------------------------------- ????* @author yangyunzhou@foxmail.com ????* @param $myid 表示获得这个ID下的所有子级 ????* @param $str 生成树形结构基本代码, 例如: "<option value=\$id \$select>\$spacer\$name</option>" ????* @param $sid 被选中的ID, 比如在做树形下拉框的时候需要用到 ????* @param $adds ????* @param $str_group ????*/ ???function get_tree($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 = $id==$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.‘&nbsp;‘,$str_group); ???????????????$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.‘&nbsp;‘); ???????????????$number++; ???????????} ???????} ???????return $this->ret; ???} ??????function have($list,$item){ ???????return(strpos(‘,,‘.$list.‘,‘,‘,‘.$item.‘,‘)); ???} ??????/** ????+------------------------------------------------ ????* 格式化数组 ????+------------------------------------------------ ????* @author yangyunzhou@foxmail.com ????+------------------------------------------------ ????*/ ???function getArray($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.‘&nbsp;‘; ???????????????$this->getArray($id, $sid, $fd); ???????????????$number++; ???????????} ???????} ??????????return $this->ret; ???}}?>用法: ??$tree = new Tree; ??????????// new 之前请记得包含tree文件!$tree->tree($data); ????????// 数据格式请参考 tree方法上面的注释! ??// 如果使用数组, 请使用 getArray方法$tree->getArray(); ??// 下拉菜单选项使用 get_tree方法$tree->get_tree();