借用一位前辈的思路和风格，将代码整理在这里

     unlimitedForLevel($cate, $html, $v['id'], $level + 1));            }        }        return $arr;    }    /**     * 返回多维数组     * @param  [type]  $cate 要递归的数组     * @param  string  $name 子级分类在父分类数组中的 key     * @param  integer $pid  父级分类ID。默认为0，表示顶级分类     * @return [type]        [description]     */    static public function unlimitedForlayer($cate, $name = 'child', $pid = 0){        $arr = array();        foreach($cate as $v){            if( $v['pid'] == $pid){                $v[$name] = self::unlimitedForlayer($cate, $name, $v['id']);                $arr[] = $v;            }        }        return $arr;    }    /**     * 传递子分类ID返回所有父级分类     * @param  [type] $cate 要递归的数组     * @param  [type] $id   子分类ID     * @return [type]       [description]     */    static public function getParents($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;    }    /**     * 传递父级分类ID返回所有子分类ID     * @param  [type] $cate 要递归的数组     * @param  [type] $pid  父级分类ID     * @return [type]       [description]     */    static public function getChildrenId($cate, $pid){        $arr = array();        foreach($cate as $v){            if($v['pid'] == $pid){                $arr[] = $v['id'];                $arr = array_merge($arr, self::getChildrenId($cate, $v['id']));            }        }        return $arr;    }    /**     * 传递父级分类ID返回所有子级分类     * @param  [type] $cate 要递归的数组     * @param  [type] $pid  父级分类ID     * @return [type]       [description]     */    static public function getChildren($cate, $pid){        $arr = array();        foreach($cate as $v){            if($v['pid'] == $pid){                $arr[] = $v;                $arr = array_merge($arr, self::getChildren($cate, $v['id']));            }        }        return $arr;    }}?>