laravel获取父类所有的子类
```
public static function getAllChild($array,$id){
$array = SalesCatalog::select('id','parent_id')->where('parent_id',$id)->get()->toArray();
$arr = array();
foreach($array as $v){
if($v['parent_id'] == $id){
$arr[] = $v['id'];
$arr = array_merge($arr,self::getAllChild($array,$v['id']));
};
};
return $arr;
}
```
>表结构如下
```
CREATE TABLE hl_sales_catalog (
id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
sales_catalog_name varchar(150) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '销售目录名称',
parent_id bigint(20) NOT NULL COMMENT '父级目录id',
sort mediumint(9) NOT NULL DEFAULT '0' COMMENT '排序:越小越往前排',
created_at timestamp NULL DEFAULT NULL,
updated_at timestamp NULL DEFAULT NULL,
PRIMARY KEY (id) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=111 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci ROW_FORMAT=DYNAMIC;
```
调用方法
`$id_list = self::getAllChild('',$id);`
