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                # get方法 返回給定鍵的項目。如果該鍵不存在,則返回 `null`。 ``` $collection = collect(['name' => 'taylor', 'framework' => 'laravel']); $value = $collection->get('name'); // taylor ``` 可以選擇性地傳遞默認值作為第二個參數: ``` $collection = collect(['name' => 'taylor', 'framework' => 'laravel']); $value = $collection->get('foo', 'default-value'); // default-value ``` 甚至可以將回調函數當作默認值。如果指定的鍵不存在,就會返回回調的結果: ``` $collection = collect(['name' => 'taylor', 'framework' => 'laravel']); $collection->get('email', function () { return 'default-value'; }); // default-value ```
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