分类接口源码：

1. <?php
2. namespace app\common\model;
3. use think\Model;
4. class Category extends Model
5. {
6. protected static $allChildrenIds = [];
7. public function getChildrenIds($cat_id,$include = 1){
8. if(empty($cat_id)){
9. return [];
10. }
11. if(is_int($cat_id) || is_string($cat_id)){
12. $cat_id = [$cat_id];
13. }
14. $cat_id = array_unique($cat_id);
15. sort($cat_id);
16. $cat_id_str = implode('_', $cat_id);
17. if(isset(self::$allChildrenIds[$cat_id_str])){
18. return self::$allChildrenIds[$cat_id_str];
19. }
20. $catIds = [];
21. $childrenIds = $cat_id;
22. if($include == 1){
23. $catIds = $cat_id;
24. }
25. while($childrenIds){
26. $childrenIds = $this->where(['parent_id' => ['in',$childrenIds]])->column('cat_id');
27. if(!empty($childrenIds)){
28. $catIds = array_merge($catIds,$childrenIds);
29. }
30. }
31. self::$allChildrenIds[$cat_id_str] = $catIds;
32. return $catIds;
33. }
34.  
35. public function getChildrenList($cat_id = 0){
36. $categoryList = $this->field('cat_id,cat_name')->where(['parent_id' => $cat_id,'is_show' => 1])->order('sort_order desc')->select();
37. foreach($categoryList as &$category){
38. if($cat_id){
39. $category['cat_url'] = $this->getUrl($category['cat_id']);
40. }
41. }
42. return $categoryList;
43. }
44.  
45. public function getUrl($cat_id) {
46. return '../category/goods?cat_id=' . $cat_id;
47. }
48. }

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