我的應用程序中有一個消息系統，我正在絞盡腦汁地試圖找出為用戶提供一個菜單來選擇他們想要閱讀的對話的最佳方法。我正在嘗試鏡像 GroupMe 樣式菜單，左側是您的對話。該對話列表是動態的，因此最近的對話位于頂部，并在您使用該應用程序時更新。我正在使用 Laravel 7 和 Firebase這是我后端的數據（經過美化）Array(? ? [-MC1kTfrrDHY3ZbidJ4Q] => Array? ? ? ? (? ? ? ? ? ? [from] => lSUfZ4sgEJd? ? ? ? ? ? [message] => test message four no more!? ? ? ? ? ? [startedAt] => 2020-07-12 11:21:10? ? ? ? ? ? [to] => CWgPqdn3YweN? ? ? ? )? ? [-MC09BsjtXP0izITsThf] => Array? ? ? ? (? ? ? ? ? ? [from] => CWgPqdn3YweN? ? ? ? ? ? [message] => test message three? ? ? ? ? ? [startedAt] => 2020-07-11 11:20:19? ? ? ? ? ? [subject] => -MC00BHCZlXUp25C5nlS? ? ? ? ? ? [to] => lSUfZ4sgEJd? ? ? ? )? ? [-MC1kAi1niswXtjY_h4s] => Array? ? ? ? (? ? ? ? ? ? [from] => CWgPqdn3YweN? ? ? ? ? ? [message] => test message two? ? ? ? ? ? [startedAt] => 2020-07-12 11:19:52? ? ? ? ? ? [to] => lSUfZ4sgEJd? ? ? ? )? ? [-MC1kOtfnIlAYtmJsD-a] => Array? ? ? ? (? ? ? ? ? ? [from] => CWgPqdn3YweN? ? ? ? ? ? [message] => test message one? ? ? ? ? ? [startedAt] => 2020-07-12 11:18:50? ? ? ? ? ? [to] => lSUfZ4sgEJd? ? ? ? )? ? ?[-MC1kOtfnIlAhgcufu] => Array? ? ? ? (? ? ? ? ? ? [from] => CWgPqdn3YweN? ? ? ? ? ? [message] => test message zero? ? ? ? ? ? [startedAt] => 2020-07-12 11:00:50? ? ? ? ? ? [to] => YLisXjk07w93? ? ? ? ))無論我是發送者還是接收者，我都希望獲得最新、獨特的對話。我想要的最終結果是這樣的Array(?[-MC1kTfrrDHY3ZbidJ4Q] => Array? ? ? ? (? ? ? ? ? ? [from] => lSUfZ4sgEJd? ? ? ? ? ? [message] => test message four no more!? ? ? ? ? ? [startedAt] => 2020-07-12 11:21:10? ? ? ? ? ? [to] => CWgPqdn3YweN? ? ? ? )?[-MC1kOtfnIlAhgcufu] => Array? ? ? ? (? ? ? ? ? ? [from] => CWgPqdn3YweN? ? ? ? ? ? [message] => test message zero? ? ? ? ? ? [startedAt] => 2020-07-12 11:00:50? ? ? ? ? ? [to] => YLisXjk07w93? ? ? ? ))有人介意提供這方面的指導嗎？
1 回答
瀟瀟雨雨
TA貢獻1833條經驗 獲得超4個贊
看看這個解決方案： https: //3v4l.org/msUPQ
我在代碼中添加了一些注釋，以防不清楚:)
只要所提供的產品$data按最新的先訂購（根據規格），就可以使用。
<?php
declare(strict_types=1);
$data = [
'-MC1kTfrrDHY3ZbidJ4Q' => [
'from' => 'lSUfZ4sgEJd',
'message' => 'test message four no more!',
'startedAt' => '2020-07-12 11:21:10',
'to' => 'CWgPqdn3YweN',
],
'-MC09BsjtXP0izITsThf' => [
'from' => 'CWgPqdn3YweN',
'message' => 'test message three',
'startedAt' => '2020-07-11 11:20:19',
'subject' => '-MC00BHCZlXUp25C5nlS',
'to' => 'lSUfZ4sgEJd',
],
'-MC1kAi1niswXtjY_h4s' => [
'from' => 'CWgPqdn3YweN',
'message' => 'test message two',
'startedAt' => '2020-07-12 11:19:52',
'to' => 'lSUfZ4sgEJd',
],
'-MC1kOtfnIlAYtmJsD-a' => [
'from' => 'CWgPqdn3YweN',
'message' => 'test message one',
'startedAt' => '2020-07-12 11:18:50',
'to' => 'lSUfZ4sgEJd',
],
'-MC1kOtfnIlAhgcufu' => [
'from' => 'CWgPqdn3YweN',
'message' => 'test message zero',
'startedAt' => '2020-07-12 11:00:50',
'to' => 'YLisXjk07w93',
],
];
function getLatestUniqueConversationMessagesByUser(array $message, string $user): array
{
$conversations = [];
$latestUniqueConversationMessages = [];
foreach ($message as $messageKey => $message) {
$participants = [$message['from'], $message['to']];
// Skip entries where $user is has not participated (not sure if needed)
if (!in_array($user, $participants)) { continue; }
// Make "to|from" same as "from|to"
sort($participants);
$conversationKey = join('|', $participants);
// Check if conversation has been handled already
if (!array_key_exists($conversationKey, $conversations)) {
$conversations[$conversationKey] = true; // Save as "handled"
$latestUniqueConversationMessages[$messageKey] = $message; // Save actual data to return
}
}
return $latestUniqueConversationMessages;
}
var_dump(getLatestUniqueConversationMessagesByUser($data, 'CWgPqdn3YweN'));
輸出：
array(2) {
["-MC1kTfrrDHY3ZbidJ4Q"]=>
array(4) {
["from"]=>
string(11) "lSUfZ4sgEJd"
["message"]=>
string(26) "test message four no more!"
["startedAt"]=>
string(19) "2020-07-12 11:21:10"
["to"]=>
string(12) "CWgPqdn3YweN"
}
["-MC1kOtfnIlAhgcufu"]=>
array(4) {
["from"]=>
string(12) "CWgPqdn3YweN"
["message"]=>
string(17) "test message zero"
["startedAt"]=>
string(19) "2020-07-12 11:00:50"
["to"]=>
string(12) "YLisXjk07w93"
}
}
使用數組函數的替代方案（不那么可讀）：
$messageKeys =
array_keys(
array_unique(
array_map(
function ($message) {
$participants = [$message['from'], $message['to']];
sort($participants);
return join('|', $participants);
},
$data
)
)
);
var_dump(
array_filter(
$data,
function ($key) use ($messageKeys) {
return in_array($key, $messageKeys);
},
ARRAY_FILTER_USE_KEY
)
);
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