我需要使用 MySQL 数据库查询以动态方式构建复杂的菜单结构。该查询允许定义用户有权使用和查看的菜单项。 Menu 结构以经典的父/子关系存储到结果集中，其中每个元素都有自己的 id 并依赖于其父 id。 Parent id = 0 表示该元素之上没有父元素(它是一个根):

MNU_ID    MNU_FUNC    MNU_PARENT    MNU_ICON    MNU_TITLE_IT    MNU_TITLE_EN
----------------------------------------------------------------------------
  1       FLTMGR      0             home        STATO FLOTTA    FLEET STATUS
  2       PSTN        0             map-marker  POSIZIONI       POSITIONS
  3       RTS         0             road        PERCORSI        ROUTES
  4       CHRTS       0             line-charts DIAGRAMMI       CHARTS
  ...
  13      MNLS        0             book        MANUALI         MANUALS
  14      RGLTNS      0             bank        NORMATIVE       REGULATIONS
  16      SPD         4             tachometer  VELOCITA'       SPEED
  17      ALT         4             area-chart  ALTITUDINE      ALTITUDE
  18      DST         4             exchange    DISTANZA        DISTANCE
  ...
  32      INSTL       13            book        INSTALLAZIONE   SETUP
  33      BASE        32            wrench      BASE            BASE
  34      FLPR        32            wrench      SONDA CARB.     FUAL PROBE

因此您可以看到元素 33 和 34 在元素 32 下，而元素 32 在元素 13 下，最后元素 13 没有父元素，因为它是根元素(它的 MNU_PARENT 为 0)。 好吧，我已经开发了我的代码以返回以下内容:

Array(
[FLTMGR] => Array(
    [icon] => fa fa-home
    [title] => STATO FLOTTA
    ),
[PSTN] => Array(
    [icon] => fa fa-map-marker
    [title] => POSIZIONI
    ),
[RTS] => Array(
    [icon] => fa fa-road
    [title] => PERCORSI
    ),
[CHRTS] => Array(
    [icon] => fa fa-line-charts
    [title] => DIAGRAMMI
    [sub] => Array(
            [SPD] => Array(
                [icon] => fa fa-tachometer
                [title] => VELOCITÁ
                ),
            [ALT] => Array(
                [icon] => fa fa-area-chart
                [title] => ALTITUDINE
                ),
            [DST] => Array(
                [icon] => fa fa-exchange
                [title] => DISTANZA
                ),
            [GSLN] => Array(
                [icon] => fa fa-tint blink
                [title] => CARBURANTE
                )
            )
        ),
...
[MNLS] => Array(
    [icon] => fa fa-book
    [title] => MANUALI
    [sub] => Array(
        [INSTL] => Array(
            [MNU_ID] => 32
            [MNU_FUNC] => INSTL
            [MNU_PARENT] => 13
            [icon] => fa fa-book
            [title] => INSTALLAZIONE
            [sub] => Array(
                [0] => Array(
                    [MNU_ID] => 33
                    [MNU_FUNC] => BASE
                    [MNU_PARENT] => 32
                    [icon] => fa fa-wrench
                    [title] => BASE
                    ),
                [1] => Array(
                    [MNU_ID] => 34
                    [MNU_FUNC] => FLPR
                    [MNU_PARENT] => 32
                    [icon] => fa fa-wrench
                    [title] => SONDA CARB.
                    )
                )
            )
        )
    ),
[RGLTNS] => Array( 
    [icon] => fa fa-bank
    [title] => NORMATIVE
    )
)

但是如您所见，我无法在第一层生成正确的结构。换句话说，如果您查看 MNLS 下的 INSTL 元素，则会出现以下错误:

1. 项目 MNU_ID、MNU_FUNC、MNU_PARENT 不应该存在(查看其他项目)
2. 'sub' 下的项目在 1 中有相同的错误。
3. 'sub' 下的项目应由 BASE、FLPR 标识，而不是由 0 和 1 标识

所以预期的结构应该是这样的:

Array(
[FLTMGR] => Array(
    [icon] => fa fa-home
    [title] => STATO FLOTTA
    ),
[PSTN] => Array(
    [icon] => fa fa-map-marker
    [title] => POSIZIONI
[RTS] => Array(
    [icon] => fa fa-road
    [title] => PERCORSI
    ),
[CHRTS] => Array(
    [icon] => fa fa-line-charts
    [title] => DIAGRAMMI
    [sub] => Array(
            [SPD] => Array(
                [icon] => fa fa-tachometer
                [title] => VELOCITÁ
                ),
            [ALT] => Array(
                [icon] => fa fa-area-chart
                [title] => ALTITUDINE
                ),
            [DST] => Array(
                [icon] => fa fa-exchange
                [title] => DISTANZA
                ),
            [GSLN] => Array(
                [icon] => fa fa-tint blink
                [title] => CARBURANTE
                )
            )
        ),
...
[MNLS] => Array(
    [icon] => fa fa-book
    [title] => MANUALI
    [sub] => Array(
        [INSTL] => Array(
            [icon] => fa fa-book
            [title] => INSTALLAZIONE
            [sub] => Array(
                [BASE] => Array(
                    [icon] => fa fa-wrench
                    [title] => BASE
                    ),
                [FLPR] => Array( 
                    [icon] => fa fa-wrench
                    [title] => SONDA CARB.
                    )
                )
            )
        )
    ),
[RGLTNS] => Array(
    [icon] => fa fa-bank
    [title] => NORMATIVE
    )
)

现在是代码:

// $MenuDB contains the Menu structure returned by the DB

// Build the basic structure
$new = array();
foreach ($MenuDB as $a){
    $new[$a['MNU_PARENT']][] = $a;
    }

// Calls the recursive function CreateTree 
$tree = createTree($new, $new[0]);  

// Make final correction (remove unwanted items and replace index with keys)
$b=replaceKeys($tree);

print_r($b);
exit();

function replaceKeys(array $input) {    
    foreach($input as $key => &$val){                   // Scan the input array, each element will go in $val, the key will be $key
        $input[$val['MNU_FUNC']]=$input[$key];          // Replace index with key, the key is the value of the field MNU_FUNC
        if(is_numeric($key)) unset($input[$key]);       // Remove the item with numeric key (index) and leave the item with non-numeric index (key)
        unset($val['MNU_ID']);                          // Remove ID
        unset($val['MNU_PARENT']);                      // Remove Parent
        unset($val['MNU_FUNC']);                        // Remove Function
        if(isset($val['sub'])) {                        // avoid to work with undefined items
            if (is_array($val['sub'])) {                // check if there are childs inside the 'sub' item
                $val['sub'] = replaceKeys($val['sub']); // if we have childs, do it again recursively
                unset($val['url']);                     // remove url element if we have childs
                unset($val['url_target']);              // remove url_target element if we have childs
                }
            }
        }
    return $input;
    }

function createTree(&$list, $parent){
    $tree = array();
    foreach ($parent as $k=>$l){
        if(isset($list[$l['MNU_ID']])){
            $l['sub'] = createTree($list, $list[$l['MNU_ID']]);
            }
        $tree[] = $l;
        } 
    return $tree;
    }

尽管我很努力，但我无法弄清楚错误在哪里。 我的工作流程有什么替代方案吗？

最佳答案

你只能使用一个递归函数:

function makeTree($array, $parent) {
    $return = [];
    foreach ($array as $key => $value) {
        if ($value['MNU_PARENT'] == $parent) {
            $return[$value['MNU_FUNC']] = [
                'icon' => 'fa fa-' . $value['MNU_ICON'],
                'title' => $value['MNU_TITLE_IT'],
            ];
            $subs = false;
            foreach ($array as $search) {
                if ($search['MNU_PARENT'] == $value['MNU_ID']) {
                    $subs = true;
                }
            }
            if ($subs === true) {
                $return[$value['MNU_FUNC']]['subs'] = makeTree($array, $value['MNU_ID']);
            }
        }
    }
    return $return;
}

$new = makeTree($arr, 0);

关于php - 从 SQL 查询结果构建父/子数组菜单结构，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48278225/