PHP无限分类代码，支持数组格式化、直接输出菜单两种方式

复制代码 代码如下:

class Tree
{


var $arr = array();


var $icon = array('│','├',' └');


var $ret = '';


function tree($arr=array())
{
$this->arr = $arr;
$this->ret = '';
return is_array($arr);
}


function get_parent($myid)
{
$newarr = array();
if(!isset($this->arr[$myid])) return false;
$pid = $this->arr[$myid]['pid'];
$pid = $this->arr[$pid]['pid'];
if(is_array($this->arr))
{
foreach($this->arr as $id => $a)
{
if($a['pid'] == $pid) $newarr[$id] = $a;
}
}
return $newarr;
}


function get_child($myid)
{
$a = $newarr = array();
if(is_array($this->arr))
{
foreach($this->arr as $id => $a)
{
if($a['pid'] == $myid) $newarr[$id] = $a;
}
}
return $newarr ? $newarr : false;
}


function get_pos($myid,&$newarr)
{
$a = array();
if(!isset($this->arr[$myid])) return false;
$newarr[] = $this->arr[$myid];
$pid = $this->arr[$myid]['pid'];
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;
}


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;
}


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.' ');
$number++;
}
}
return $this->ret;
}

function have($list,$item){
return(strpos(',,'.$list.',',','.$item.','));
}


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['title'] = $spacer.' '.$a['title'];
$this->ret[$a['id']] = $a;
$fd = $adds.$k.' ';
$this->getArray($id, $sid, $fd);
$number++;
}
}

return $this->ret;
}
}
?>