[TOC] # 問題 在 laravel 中，使用 collect 處理數組是一件非常棒的事情。 廢話少說！直接看代碼，下面是一段簡單的根據字段 id 去除重復記錄的處理 ~~~ $arr = [ ['id' => 1, 'name' => 'lily'], ['id' => 2, 'name' => 'lucy'], ['id' => 1, 'name' => 'lily', 'email' => 'lily@temp.cn'], ['id' => 3, 'name' => 'hanmeimei'], ['id' => 4, 'name' => 'xiaocun'], ['id' => 5, 'name' => 'donggua'] ]; $result = collect($arr)->unique('id')->take(3)->toArray(); /* 處理的結果是 [ 0 => [ "id" => 1, "name" => "lily", ], 1 => [ "id" => 2, "name" => "lucy", ], 3 => [ "id" => 3, "name" => "hanmeimei", ], ] */ ~~~ 然而，現實開發中通常遇到的數組并不都那么友好，當數組變成這樣了： ~~~ $arr = [ ['_source' => ['id' => 1, 'name' => 'lily'], '_id' => 1], ['_source' => ['id' => 2, 'name' => 'lucy'], '_id' => 2], ['_source' => ['id' => 1, 'name' => 'lily', 'email' => 'lily@temp.cn'], '_id' => '1game'], ['_source' => ['id' => 3, 'name' => 'hanmeimei'], '_id' => 3], ['_source' => ['id' => 4, 'name' => 'xiaocun'], '_id' => '4app'], ['_source' => ['id' => 5, 'name' => 'donggua'], '_id' => 'app5'] ]; ~~~ 那么，又該如何根據字段 id 去重呢？ # 解決 ~~~ $result = collect($arr)->unique(function($item){ return $item['_source ']['id']; })->take(3)->toArray(); ~~~