PHP数组过滤：移除已出现的双向用户对话记录

云原生阿岚

2026-8-11

解决PHP数组中过滤双向重复对话的问题

错误原因分析

你之前用array_filter的写法逻辑有误：当使用ARRAY_FILTER_USE_BOTH时，回调里的$k是外层数组的索引（比如0、1、2），而非数组元素内部的键名（比如id_sender），所以你的条件永远不会成立，自然过滤无效。

正确实现思路

要过滤双向重复对话，关键是给每一组对话生成唯一的统一标识：将对话双方的id_sender和id_receiver按从小到大排序后拼接成字符串，这样A→B和B→A会生成完全相同的标识。然后用一个辅助数组记录已经出现过的标识，遍历原数组时只保留首次出现的对话。

代码实现

$conversations = [
    ["id" => 76, "id_sender" => 1, "id_receiver" => 2, "message" => "2 Miliar", "is_read" => 0, "created_at" => "2022-11-28T13:57:17.000000Z", "updated_at" => "2022-11-28T13:57:17.000000Z"],
    ["id" => 75, "id_sender" => 1, "id_receiver" => 3, "message" => "1 Miliar", "is_read" => 0, "created_at" => "2022-11-28T13:57:10.000000Z", "updated_at" => "2022-11-28T13:57:10.000000Z"],
    ["id" => 74, "id_sender" => 3, "id_receiver" => 1, "message" => "Property ini berapa harganya?", "is_read" => 1, "created_at" => "2022-11-28T13:52:57.000000Z", "updated_at" => "2022-11-28T13:55:37.000000Z"],
    ["id" => 73, "id_sender" => 2, "id_receiver" => 1, "message" => "Untuk yang ini berapa harganya?", "is_read" => 1, "created_at" => "2022-11-28T13:07:34.000000Z", "updated_at" => "2022-11-28T13:55:33.000000Z"]
];

$seen = [];
$filtered = [];

foreach ($conversations as $conv) {
    // 生成统一标识：将两个id排序后拼接
    $pair = [$conv['id_sender'], $conv['id_receiver']];
    sort($pair);
    $key = implode('-', $pair);
    
    if (!isset($seen[$key])) {
        $seen[$key] = true;
        $filtered[] = $conv;
    }
}

// 输出结果
print_r($filtered);