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Infinite classification means that starting from the highest classification, each sub-category can be divided into several sub-categories of its own, which can be divided all the time, which is called infinite classification;
The following is the classification Examples of Infinitus classification of provinces, cities and counties. The database is as shown in the figure:
The code example is as follows:
/** * @Description: 无限极分类一 * @Author: Yang * @param $data 数据库数据 * @param int $parent_id 父级ID * @return array */ function getTree1($data, $parent_id = 0) { $tree = array(); foreach ($data as $k => $v) { if ($v["parent_id"] == $parent_id) { unset($data[$k]); if (!empty($data)) { $children = getCategory($data, $v["id"]); if (!empty($children)) { $v["_child"] = $children; } } $tree[] = $v; } } return $tree; } /** * @Description: 无限极分类二 * @Author: Yang * @param $data 数据库数据 * @param int $parent_id 父级ID * @param int $level 等级 * @return array */ function getTree2($data, $parent_id = 0, $level = 0) { static $tree = array(); foreach ($data as $k => $v) { if ($v["parent_id"] == $parent_id) { $v["level"] = $level; $tree[] = $v; getTree($data, $v["id"], $level + 1); } } return $tree; } /** * @Description: 无限分类三:面包屑导航 * @Author: Yang * @param $data 数据库数据 * @param $id 分类ID * @return array */ function getCrumbsBar($data, $id) { static $tree = array(); foreach ($data as $k => $v) { if ($v["id"] == $id) { getCrumbsBar($data, $v["parent_id"]); $tree[] = $v; } } return $tree; }
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