递归实现无限级分类

<?php
Class Category{
//排序数组
static public function unlimitedForLevel($cate,$html="  --",$pid=0,$level=0){

$arr = array();

foreach($cate as $v){

if($v['pid'] == $pid){

$v['level'] = $level+1;

$v['html'] = str_repeat($html,$level);

$arr[] = $v;

$arr = array_merge($arr,self::unlimitedForLevel($cate,$html,$v['id'],$level+1));
}

}

return $arr;
}
//组合数组 用于做导航栏
static public function unlimitedForLayer($cate,$name='child',$pid=0){

$arr = array();

foreach($cate as $v){

if($v['pid']==$pid){

$v['child'] = self::unlimitedForLayer($cate,$name,$v['id']);

$arr[] = $v;
}
}

return $arr;
}

//传递一个子分类ID获得父级目录 用户制作当前位置导航条
Static Public function getParents($cate,$id){

$arr = array();

foreach($cate as $v){

if($v['id']==$id){

$arr[] = $v;

$arr = array_merge(self::getParents($cate,$v['pid']),$arr);

}
}

return $arr;

}

//传递一个父级分类ID返回所有子分类ID

Static Public function getChildsId($cate,$pid){

$arr = array();

foreach($cate as $v){

if($v['pid']==$pid){

$arr[] = $v['id'];

$arr = array_merge($arr,self::getChildsId($cate,$v['id']));
}
}

return $arr;

}

//传递一个父类ID获得其所有子集分类
Static Public function getChilds($cate ,$pid){

$arr = array();

foreach($cate as $v){

if($v['pid']==$pid){

$arr[] = $v;

$arr = array_merge($arr,self::getChilds($cate,$v['id']));
}
}

return $arr;

}
}

?>