php无限分类且支持输出树状图的详细介绍

PHP 2018-12-30

<div class="codetitle"><a style="CURSOR: pointer" data="91317" class="copybut" id="copybut91317" onclick="doCopy('code91317')"> 代码如下:

<div class="codebody" id="code91317">
<?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 $ret = ''; /
构造函数，初始化类
@param array 2维数组，例如：
array(
1 => array('id'=>'1','parentid'=>0,'name'=>'一级栏目一'),
2 => array('id'=>'2','name'=>'一级栏目二'),
3 => array('id'=>'3','parentid'=>1,'name'=>'二级栏目一'),
4 => array('id'=>'4','name'=>'二级栏目二'),
5 => array('id'=>'5','parentid'=>2,'name'=>'二级栏目三'),
6 => array('id'=>'6','parentid'=>3,'name'=>'三级栏目一'),
7 => array('id'=>'7','name'=>'三级栏目二')
)
/
function tree($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"
@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,$sid,$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,$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,$adds.$k.'');
$number++;
}
}
return $this->ret;
} function have($list,$item){
return(strpos(','.$list.',','.$item.','));
}
}
?>