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                ## duplicates 方法從集合中檢索并返回重復的值: duplicates 方法從集合中檢索并返回重復的值: ``` $collection = collect(['a', 'b', 'a', 'c', 'b']); $collection->duplicates(); // [2 => 'a', 4 => 'b']Copy ``` 如果集合包含數組或對象,則可以傳遞希望檢查重復值的屬性的鍵: ``` $employees = collect([ ['email' => 'abigail@example.com', 'position' => 'Developer'], ['email' => 'james@example.com', 'position' => 'Designer'], ['email' => 'victoria@example.com', 'position' => 'Developer'], ]) $employees->duplicates('position'); // [2 => 'Developer']Copy ```
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