我有一個(gè)稱為表mappings有id，leaf，parent_id，name和flip_parent列。parent_id和flip_parent都是引用 的整數(shù)mapping。id柱子。flip_parent持有一個(gè)應(yīng)該從樹中排除的值的 id。為此，我有以下函數(shù)（$mappings都是mappings表中的所有行，flipParentIds都是同一個(gè)表中的flip_parent值不是null）private function removeFlipParents(array $mappings, array $flipParentIds){    foreach ($mappings as $key => $mapping) {        foreach ($flipParentIds as $id) {            if ($mapping['id'] === $id['flipParent']) {                unset($mappings[$key]);            }        }    }    return $mappings;}刪除這些值后，我需要用剩余的數(shù)據(jù)構(gòu)建一棵樹（樹有 5/6 層深），這是通過以下代碼完成的；private function buildTree(array $elements, $parentId){    $branch = [];    foreach ($elements as $element) {       if ($element['parentId'] == $parentId) {            $children = $this->buildTree($elements, $element['id']);            if ($children) {                $element['children'] = $children;            } else {                $element['children'] = [];            }        }    }    return $branch;}在這種情況下elements與 相同的數(shù)組$mappings，但沒有那些翻轉(zhuǎn)父母。此函數(shù)的結(jié)果作為 JSON 響應(yīng)返回，并由 Javascript 處理以構(gòu)建樹。返回的 JSON 結(jié)構(gòu)與此類似；[{    "id": 1, "name": "Node 1", "children": [{      "id": 2, "name": "Node 1.1", "children": [{        "id": 4, "name": "Node 1.1.1", "leaf": true, "children": [], "gls": [{          "id": 1000, "name": "GL1", "code": "0100"        }, {          "id": 1001, "name": "GL2", "code": "0200"        }]      }, {        "id": 5, "name": "Node 1.1.2", "leaf": true, "children": [], "gls": [{          "id": 2000, "name": "GL3", "code": "0300"        }, {          "id": 2001, "name": "GL4", "code": "0400"        }]      }]    }, {      "id": 3, "name": "Node 1.2", "children": [{        "id": 6, "name": "Node 1.2.1", "leaf": true, "children": [], "gls": [{          "id": 3000, "name": "GL5", "code": "0500"        }, {          "id": 3001, "name": "GL6", "code": "0600"        }]      }]    }]  },