代码语言：javascript复制
<?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 $str 生成树形结构基本代码, 例如: "<option value=$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 $str_group
* @return unknown_type
*/
function get_tree($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.' : '.$selected.' . <br/>';
@extract($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 . ','));
}
}
