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1 | <?php |
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2 | |||
3 | namespace Spatie\CollectionMacros\Macros; |
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4 | |||
5 | use Illuminate\Support\Collection; |
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6 | |||
7 | /* |
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8 | * Extract keys from a collection, like `only`, except: |
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9 | * - If a value doesn't exist, it returns null instead of omitting it |
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10 | * - It returns a collection without keys, so `list()` can be used. |
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11 | * |
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12 | * @return \Illuminate\Support\Collection |
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13 | */ |
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14 | class Extract |
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15 | { |
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16 | public function __invoke() |
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17 | { |
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18 | return function ($keys): Collection { |
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19 | $keys = is_array($keys) ? $keys : func_get_args(); |
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20 | |||
21 | return array_reduce($keys, function ($extracted, $key) { |
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22 | return $extracted->push( |
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23 | data_get($this->items, $key) |
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24 | ); |
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25 | }, new static()); |
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26 | }; |
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27 | } |
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28 | } |
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29 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: