$arr = [
[
"id" => '6230061c0e88d709ca0d7bbc',
'name' => 'Mobile SamSung',
'slug' => 'mobile-samsung',
'createdAt' => '1648006346'
],
[
"id" => '5d1eff529a426778d4b92383',
'name' => 'Mobile Iphone',
'slug' => 'mobile-iphone',
'createdAt' => '1647314181'
],
[
"id" => '5d1eff6b9a426778d4b92dc4',
'name' => 'Mobile SamSung',
'slug' => 'mobile-samsung',
'createdAt' => '1647314460'
],
[
"id" => '5f894011266aea580b028cb0',
'name' => 'Mobile LG',
'slug' => 'mobile-lg',
'createdAt' => '1647314456'
]
];
我有一個陣列，在這個陣列中有很多重復的子陣列，現在我想洗掉里面的重復陣列，只保留最新的資料createdAt。請給我你的意見。謝謝
我想得到一個這樣的陣列：
$arr = [
[
"id" => '6230061c0e88d709ca0d7bbc',
'name' => 'Mobile SamSung',
'slug' => 'mobile-samsung',
'createdAt' => '1648006346'
],
[
"id" => '5d1eff529a426778d4b92383',
'name' => 'Mobile Iphone',
'slug' => 'mobile-iphone',
'createdAt' => '1647314181'
],
[
"id" => '5f894011266aea580b028cb0',
'name' => 'Mobile LG',
'slug' => 'mobile-lg',
'createdAt' => '1647314456'
]
];
uj5u.com熱心網友回復：
您不應該對您的資料進行一次以上的傳遞。只需將這些name值用作臨時鍵，然后僅在其createAt值大于存盤的值時保留重復行的資料。完成回圈后重新索引陣列。
代碼：（演示）
$result = [];
foreach ($arr as $row) {
if (!isset($result[$row['name']]) || (int)$row['createdAt'] > (int)$result[$row['name']]['createdAt']) {
$result[$row['name']] = $row;
}
}
var_export(array_values($result));
輸出：
array (
0 =>
array (
'id' => '6230061c0e88d709ca0d7bbc',
'name' => 'Mobile SamSung',
'slug' => 'mobile-samsung',
'createdAt' => '1648006346',
),
1 =>
array (
'id' => '5d1eff529a426778d4b92383',
'name' => 'Mobile Iphone',
'slug' => 'mobile-iphone',
'createdAt' => '1647314181',
),
2 =>
array (
'id' => '5f894011266aea580b028cb0',
'name' => 'Mobile LG',
'slug' => 'mobile-lg',
'createdAt' => '1647314456',
),
)
潛在幫助：
- Laravel - 從 x 列中具有最高值的表中獲取唯一行
- 根據一個值從陣列中洗掉重復的物件，保持 PHP 中其他值的最低值？
- 過濾具有唯一列值的行并優先考慮另一列中具有特定值的行
- 如何在陣列中的同一鍵中獲取最大值
uj5u.com熱心網友回復：
解釋：
slug在此解決方案中，我使用具有最新密鑰的唯一密鑰獲取資料createdAt。我們可以將任何唯一鍵匹配到多維陣列中，并獲得我們想要的任何結果。
代碼：
$newArray = [];
foreach ($array as $key => $value) {
$findIndex = array_search($value['slug'], array_column($newArray, 'slug'));
if ($findIndex === false) {
$newArray[] = $value;
} elseif ($findIndex !== false && $newArray[$findIndex]['createdAt'] <= $value['createdAt']) {
$newArray[$findIndex] = $value;
}
}
print_r($newArray);
演示鏈接（包含您的資料）：https ://3v4l.org/f4kRM
演示鏈接（按我的方式定制資料）：https ://3v4l.org/sj4MW
uj5u.com熱心網友回復：
首先按創建時間排序，然后洗掉重復項。
<?php
$arr = [
[
"id" => '6230061c0e88d709ca0d7bbc',
'name' => 'Mobile SamSung',
'slug' => 'mobile-samsung',
'createdAt' => '1648006346'
],
[
"id" => '5d1eff529a426778d4b92383',
'name' => 'Mobile Iphone',
'slug' => 'mobile-iphone',
'createdAt' => '1647314181'
],
[
"id" => '5d1eff6b9a426778d4b92dc4',
'name' => 'Mobile SamSung',
'slug' => 'mobile-samsung',
'createdAt' => '1647314460'
],
[
"id" => '5f894011266aea580b028cb0',
'name' => 'Mobile LG',
'slug' => 'mobile-lg',
'createdAt' => '1647314456'
]
];
function sort_objects_by_created($a, $b) {
if($a['createdAt'] == $b['createdAt']){ return 0 ; }
return ($a['createdAt'] > $b['createdAt']) ? -1 : 1;
}
// Let's sort
usort($arr, 'sort_objects_by_created');
$slugs = [];
$result = [];
// Loop object
foreach($arr as $phone) {
// If slug is not found, add to result
if (!in_array($phone['slug'], $slugs)){
$slugs[] = $phone['slug'];
$result[] = $phone;
}
}
var_dump($result,$slugs);
uj5u.com熱心網友回復：
可能值得注意的是，您可以在創建陣列時改進上游。（總是向上游看！）
如果你能給你基本陣列一個創建的鍵，你可以使用陣列排序，這將使這一步更有效......
例如
$arr = [];
$arr[2022-01-01] = Array('id' => 123, 'name' = 'abc');
$arr[2022-04-01] = Array('id' => 123, 'name' = 'abc');
$arr[2022-08-01] = Array('id' => 123, 'name' = 'abc');
轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/452483.html