我使用下面的代碼行來遍歷數據庫中的一個表：

$items_thread = $connection -> fetch_all($sql);

如果我打印出來的陣列：

print_r($items_thread);

我會得到這個：

Array

(

[0] => Array

(

[RecipientID] => 3

[RecipientScreenname] => Tom L

[RecipientFirstname] => Thomas

[RecipientEmail] => info@xx.com

)

[1] => Array

(

[RecipientID] => 3

[RecipientScreenname] => Tom L

[RecipientFirstname] => Thomas

[RecipientEmail] => info@xx.com

)

[2] => Array

(

[RecipientID] => 1

[RecipientScreenname] => Lau T

[RecipientFirstname] => TK

[RecipientEmail] => lau@xx.co.uk

)

)

但是我想擺脫數組中的重復項，所以我使用array_unique

print_r(array_unique($items_thread));

我得到以下奇怪的結果，這不是我正在尋找的：

Array

(

[0] => Array

(

[RecipientID] => 3

[RecipientScreenname] => Tom L

[RecipientFirstname] => Thomas

[RecipientEmail] => info@xx.com

)

)

理想情況下，我認為應該返回：

Array

(

[0] => Array

(

[RecipientID] => 3

[RecipientScreenname] => Tom L

[RecipientFirstname] => Thomas

[RecipientEmail] => info@xx.com

)

[1] => Array

(

[RecipientID] => 1

[RecipientScreenname] => Lau T

[RecipientFirstname] => TK

[RecipientEmail] => lau@xx.co.uk

)

)

我該怎么做才能正確的？我使用錯誤的PHP語法/默認功能？