复制代码代码如下:php/*** 通用的树型类，可以生成任何树型结构*/ class tree{/*** 生成树型结构所需要的2维数组* @var array*/ var $arr = array();/*** 生成树型结构所需修饰符号，可以换成图片* @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 Midnight(杨云洲), 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: "\$spacer\$name"* @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 $str_group* @return unknown_type*/ function get_tree($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.' ',$str_group);$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' : '';//echo $sid.'=>'.$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.','));}}?>