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{#186 ▼
  +"results": Collection {#203 ▼
    #items: array:15 [▼
      0 => {#218 ▼
        +"wrapperType": "track"
        +"kind": "song"
        +"artistId": 32940
        +"collectionId": 159292399
        +"trackId": 159293848
        +"artistName": "Michael Jackson"
        +"collectionName": "The Essential Michael Jackson"
        +"trackName": "Billie Jean"
        +"collectionCensoredName": "The Essential Michael Jackson"
        +"trackCensoredName": "Billie Jean (Single Version)"
        +"artistViewUrl": "https://itunes.apple.com/us/artist/michael-jackson/id32940?uo=4"
        +"collectionViewUrl": "https://itunes.apple.com/us/album/billie-jean-single-version/id159292399?i=159293848&uo=4"
        +"trackViewUrl": "https://itunes.apple.com/us/album/billie-jean-single-version/id159292399?i=159293848&uo=4"
        +"previewUrl": "https://audio-ssl.itunes.apple.com/apple-assets-us-std-000001/AudioPreview122/v4/c6/50/11/c6501132-e865-3711-175a-ddb79114e42f/mzaf_3806132797788612279.plus.aac ▶"
        +"artworkUrl30": "http://is2.mzstatic.com/image/thumb/Music127/v4/8a/65/be/8a65bef2-f23d-e43d-9124-f5e4293513f7/source/30x30bb.jpg"
        +"artworkUrl60": "http://is2.mzstatic.com/image/thumb/Music127/v4/8a/65/be/8a65bef2-f23d-e43d-9124-f5e4293513f7/source/60x60bb.jpg"
        +"artworkUrl100": "http://is2.mzstatic.com/image/thumb/Music127/v4/8a/65/be/8a65bef2-f23d-e43d-9124-f5e4293513f7/source/100x100bb.jpg"
        +"collectionPrice": 16.99
        +"trackPrice": 1.29
        +"trackNumber": 16
        +"trackTimeMillis": 294601
        +"country": "USA"
        +"currency": "USD"
        +"primaryGenreName": "Pop"
        +"isStreamable": true
      }
      1 => {#217 ▶}
      2 => {#216 ▶}
      3 => {#215 ▶}

Answer 1

这是一个简单的可迭代对象，没有什么特别的或与Laravel相关的。

你可以这样做：

$sum = 0;

foreach ($response['results']->items as $item) {
    $sum += $item->trackTimeMillis;
}

var_dump($sum);

Answer 2

你应该可以用一行代码来做到这一点：

$total = $response->results->sum('trackTimeMillis');