如何在多维数组中执行 foreach 循环值 PHP

Question

我正在使用 Spotify API，我只想对 ['tracks'][0]["album"]["images"][ 中的值执行 foreach 循环2]['url']

我该怎么做？

我试着做一个 foreach 循环来检索多维关联数组中每个关联键的值，遍历每个元素，但仍然可以让它工作。

Answer 1

我会这样处理：

$api = array (
    'tracks' => 
    array (
      0 => 
      array (
        'album' => 
        array (
          'album_type' => 'album',
          'artists' => 
          array (
            0 => 
            array (
              'external_urls' => 
              array (
                'spotify' => 'https://open.spotify.com/artist/4ovtyvs7j1jSmwhkBGHqSr',
              ),
              'href' => 'https://api.spotify.com/v1/artists/4ovtyvs7j1jSmwhkBGHqSr',
              'id' => '4ovtyvs7j1jSmwhkBGHqSr',
              'name' => 'Olamide',
              'type' => 'artist',
              'uri' => 'spotify:artist:4ovtyvs7j1jSmwhkBGHqSr',
            ),
          ),
          'external_urls' => 
          array (
            'spotify' => 'https://open.spotify.com/album/6fG2eFCgUmytQWL6umtsCh',
          ),
          'href' => 'https://api.spotify.com/v1/albums/6fG2eFCgUmytQWL6umtsCh',
          'id' => '6fG2eFCgUmytQWL6umtsCh',
          'images' => 
          array (
            0 => 
            array (
              'height' => '640',
              'url' => 'https://i.scdn.co/image/ab67616d0000b27387d20b9a27d5e14d74b5cb77',
              'width' => '640',
            ),
            1 => 
            array (
              'height' => '300',
              'url' => 'https://i.scdn.co/image/ab67616d00001e0287d20b9a27d5e14d74b5cb77',
              'width' => '300',
            ),
            2 => 
            array (
              'height' => '64',
              'url' => 'https://i.scdn.co/image/ab67616d0000485187d20b9a27d5e14d74b5cb77',
              'width' => '64',
            ),
          ),
          'name' => 'Carpe Diem',
          'release_date' => '2020-10-07',
          'release_date_precision' => 'day',
          'total_tracks' => '12',
          'type' => 'album',
          'uri' => 'spotify:album:6fG2eFCgUmytQWL6umtsCh',
        ),
        'artists' => 
        array (
          0 => 
          array (
            'external_urls' => 
            array (
              'spotify' => 'https://open.spotify.com/artist/4ovtyvs7j1jSmwhkBGHqSr',
            ),
            'href' => 'https://api.spotify.com/v1/artists/4ovtyvs7j1jSmwhkBGHqSr',
            'id' => '4ovtyvs7j1jSmwhkBGHqSr',
            'name' => 'Olamide',
            'type' => 'artist',
            'uri' => 'spotify:artist:4ovtyvs7j1jSmwhkBGHqSr',
          ),
          1 => 
          array (
            'external_urls' => 
            array (
              'spotify' => 'https://open.spotify.com/artist/5yOvAmpIR7hVxiS6Ls5DPO',
            ),
            'href' => 'https://api.spotify.com/v1/artists/5yOvAmpIR7hVxiS6Ls5DPO',
            'id' => '5yOvAmpIR7hVxiS6Ls5DPO',
            'name' => 'Omah Lay',
            'type' => 'artist',
            'uri' => 'spotify:artist:5yOvAmpIR7hVxiS6Ls5DPO',
          ),
        ),
        'disc_number' => '1',
        'duration_ms' => '171764',
        'explicit' => '1',
        'external_ids' => 
        array (
          'isrc' => 'USUYG1330802',
        ),
        'external_urls' => 
        array (
          'spotify' => 'https://open.spotify.com/track/5DS9LiyEdw2zY8bM6kjjgM',
        ),
        'href' => 'https://api.spotify.com/v1/tracks/5DS9LiyEdw2zY8bM6kjjgM',
        'id' => '5DS9LiyEdw2zY8bM6kjjgM
                      [is_local] => ',
        'is_playable' => '1',
        'name' => 'Infinity (feat. Omah Lay)',
        'popularity' => '73',
        'preview_url' => 'https://p.scdn.co/mp3-preview/5159fa17676fc96e32db13b7680f7497d5c2f74d?cid=756f211306ad4c9a934d07c5722790b5',
        'track_number' => '3',
        'type' => 'track',
        'uri' => 'spotify:track:5DS9LiyEdw2zY8bM6kjjgM',
      ),
      1 => 
      array (
        'album' => 
        array (
          'album_type' => 'album',
          'artists' => 
          array (
            0 => 
            array (
              'external_urls' => 
              array (
                'spotify' => 'https://open.spotify.com/artist/4ovtyvs7j1jSmwhkBGHqSr',
              ),
              'href' => 'https://api.spotify.com/v1/artists/4ovtyvs7j1jSmwhkBGHqSr',
              'id' => '4ovtyvs7j1jSmwhkBGHqSr',
              'name' => 'Olamide',
              'type' => 'artist',
              'uri' => 'spotify:artist:4ovtyvs7j1jSmwhkBGHqSr',
            ),
          ),
          'external_urls' => 
          array (
            'spotify' => 'https://open.spotify.com/album/6fG2eFCgUmytQWL6umtsCh',
          ),
          'href' => 'https://api.spotify.com/v1/albums/6fG2eFCgUmytQWL6umtsCh',
          'id' => '6fG2eFCgUmytQWL6umtsCh',
          'images' => 
          array (
            0 => 
            array (
              'height' => '640',
              'url' => 'https://i.scdn.co/image/ab67616d0000b27387d20b9a27d5e14d74b5cb77',
              'width' => '640',
            ),
            1 => 
            array (
              'height' => '300',
              'url' => 'https://i.scdn.co/image/ab67616d00001e0287d20b9a27d5e14d74b5cb77',
              'width' => '300',
            ),
            2 => 
            array (
              'height' => '64',
              'url' => 'https://i.scdn.co/image/ab67616d0000485187d20b9a27d5e14d74b5cb77',
              'width' => '64',
            ),
          ),
          'name' => 'Carpe Diem',
          'release_date' => '2020-10-07',
          'release_date_precision' => 'day',
          'total_tracks' => '12',
          'type' => 'album',
          'uri' => 'spotify:album:6fG2eFCgUmytQWL6umtsCh',
        ),
        'artists' => 
        array (
          0 => 
          array (
            'external_urls' => 
            array (
              'spotify' => 'https://open.spotify.com/artist/4ovtyvs7j1jSmwhkBGHqSr',
            ),
            'href' => 'https://api.spotify.com/v1/artists/4ovtyvs7j1jSmwhkBGHqSr',
            'id' => '4ovtyvs7j1jSmwhkBGHqSr',
            'name' => 'Olamide',
            'type' => 'artist',
            'uri' => 'spotify:artist:4ovtyvs7j1jSmwhkBGHqSr',
          ),
          1 => 
          array (
            'external_urls' => 
            array (
              'spotify' => 'https://open.spotify.com/artist/68R39izwNAztATrXMOqkJS',
            ),
            'href' => 'https://api.spotify.com/v1/artists/68R39izwNAztATrXMOqkJS',
            'id' => '68R39izwNAztATrXMOqkJS',
            'name' => 'Bad Boy Timz',
            'type' => 'artist',
            'uri' => 'spotify:artist:68R39izwNAztATrXMOqkJS',
          ),
        ),
        'disc_number' => '1',
        'duration_ms' => '194000',
        'explicit' => '1',
        'external_ids' => 
        array (
          'isrc' => 'USUYG1330809',
        ),
        'external_urls' => 
        array (
          'spotify' => 'https://open.spotify.com/track/558ULLj8yY2vT8XGtgY0q9',
        ),
        'href' => 'https://api.spotify.com/v1/tracks/558ULLj8yY2vT8XGtgY0q9',
        'id' => '558ULLj8yY2vT8XGtgY0q9
                      [is_local] => ',
        'is_playable' => '1',
        'name' => 'Loading (feat. Bad Boy Timz)',
        'popularity' => '64',
        'preview_url' => 'https://p.scdn.co/mp3-preview/7848a9f9ea879e6b1c6618508354e2559678aa8c?cid=756f211306ad4c9a934d07c5722790b5',
        'track_number' => '10',
        'type' => 'track',
        'uri' => 'spotify:track:558ULLj8yY2vT8XGtgY0q9',
      ),
    ),
);

$tracks = [];

foreach ($api['tracks'] as $track) {
    $_track = [
        'artists' => '',
        'name' => '',
        'album' => '',
        'image' => ''
    ];

    $artists = [];
    foreach ($track['artists'] as $artist) {
        $artists[] = $artist['name'];
    }
    $_track['artists'] = implode(', ', $artists);

    $_track['name'] = $track['name'];
    $_track['album'] = $track['album']['name'];
    $_track['image'] = $track['album']['images'][2]['url'];
    
    $tracks[] = $_track;
}

var_dump($tracks);

结果：

array(2) {
  [0]=>
  array(4) {
    ["artists"]=>
    string(17) "Olamide, Omah Lay"
    ["name"]=>
    string(25) "Infinity (feat. Omah Lay)"
    ["album"]=>
    string(10) "Carpe Diem"
    ["image"]=>
    string(64) "https://i.scdn.co/image/ab67616d0000485187d20b9a27d5e14d74b5cb77"
  }
  [1]=>
  array(4) {
    ["artists"]=>
    string(21) "Olamide, Bad Boy Timz"
    ["name"]=>
    string(28) "Loading (feat. Bad Boy Timz)"
    ["album"]=>
    string(10) "Carpe Diem"
    ["image"]=>
    string(64) "https://i.scdn.co/image/ab67616d0000485187d20b9a27d5e14d74b5cb77"
  }
}

Answer 2

这可以通过 array_walk_recursive 轻松完成。无论您的 url key/value 在什么深度或位置，它都会被发现并迭代。如下：

$urls = []; // For collecting URLs, passed in by reference:

array_walk_recursive($data, function($val, $key) use (&$urls) {
    if($key === 'url') { // if $key is "url", add to $urls; ignore the rest.
        $urls[] = $val;
    }
});

请注意，如果您在不同 depths/positions 处有多个 url 键，它们将全部添加进去。如果您需要针对可能存在多个相同键的特定 depth/position ，解决方案会稍微复杂一些。在您的用例中，这不是问题，所以我保持简单。

另请注意，array_walk_recursive 回调函数仅在“叶”或数组的最终值上调用。因此，它将不会在 包含数组 的数组成员上调用。 Non-final 数组成员将简单地继续前进，直到找到“叶子”。

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