PHP如何将路径字符串生成带层级URL的面包屑数组？

给定路径字符串 Indoformosa/Folder1/SubFolder1，需要生成包含层级URL的面包屑数组，要求每个后续项的URL是前面所有路径段的拼接，格式示例如下：

[
    0 => [
        'label' => 'Indoformosa',
        'url' => 'Indoformosa'
    ],
    1 => [
        'label' => 'Folder1',
        'url' => 'Indoformosa/Folder1'
    ],
    2 => [
        'label' => 'SubFolder1',
        'url' => 'Indoformosa/Folder1/SubFolder1'
    ]
]

当前使用的PHP代码无法生成层级URL，仅输出单个路径段的URL：

$queryParamsPath = 'Indoformosa/Folder1/SubFolder1';
$links = explode('/', $queryParamsPath);
$links = array_map(function ($el) {
    return [
       'label' => $el,
       'url' => Url::to($el)
    ];
}, $links);

错误输出结果：

[
    0 => [
        'label' => 'Indoformosa',
        'url' => 'Indoformosa'
    ],
    1 => [
        'label' => 'Folder1',
        'url' => 'Folder1'
    ],
    2 => [
        'label' => 'SubFolder1',
        'url' => 'SubFolder1'
    ]
]

修正方案 #

原代码的问题在于array_map仅处理单个路径段，没有累加前面的路径。可以通过以下两种方式逐步构建层级URL：

方法1：使用foreach循环

$queryParamsPath = 'Indoformosa/Folder1/SubFolder1';
$segments = explode('/', $queryParamsPath);
$breadcrumbs = [];
$currentPath = '';

foreach ($segments as $segment) {
    // 拼接当前路径，避免开头出现多余斜杠
    $currentPath = $currentPath ? $currentPath . '/' . $segment : $segment;
    $breadcrumbs[] = [
        'label' => $segment,
        'url' => Url::to($currentPath)
    ];
}

方法2：使用array_reduce

$queryParamsPath = 'Indoformosa/Folder1/SubFolder1';
$segments = explode('/', $queryParamsPath);

$breadcrumbs = array_reduce($segments, function ($carry, $segment) {
    $currentPath = $carry['currentPath'] ? $carry['currentPath'] . '/' . $segment : $segment;
    $carry['breadcrumbs'][] = [
        'label' => $segment,
        'url' => Url::to($currentPath)
    ];
    $carry['currentPath'] = $currentPath;
    return $carry;
}, ['breadcrumbs' => [], 'currentPath' => ''])['breadcrumbs'];

修正后输出 #

两种方法都会生成符合要求的面包屑数组：

[
    0 => [
        'label' => 'Indoformosa',
        'url' => 'Indoformosa'
    ],
    1 => [
        'label' => 'Folder1',
        'url' => 'Indoformosa/Folder1'
    ],
    2 => [
        'label' => 'SubFolder1',
        'url' => 'Indoformosa/Folder1/SubFolder1'
    ]
]

内容的提问来源于stack exchange，提问作者Fadly Dzil