PHP-数组仅使用特定值唯一

Question

我有一个看起来像这样的php数组...

Array
(
    [0] => Array
    (
        [id] => 1
        [value] => 111
        [date] => 'today'
    )
[1] => Array
    (
        [id] => 2
        [value] => 222
        [date] => 'today'
    )
[2] => Array
    (
        [id] => 3
        [value] => 333
        [date] => 'today'
    )
[3] => Array
    (
        [id] => 1
        [value] => 111
        [date] => 'today'
    )
[4] => Array
    (
        [id] => 5
        [value] => 111
        [date] => 'today'
    )

(

如果我这样使用array_unique ...

print_r(array_unique($array, SORT_REGULAR));

它删除了正确的副本[3]，但是我正在寻找一种忽略[id]的方法，并且仅按[date]和[value]匹配，以便我的输出看起来像这样...

Array
(
    [0] => Array
    (
        [id] => 1
        [value] => 111
        [date] => 'today'
    )
[1] => Array
    (
        [id] => 2
        [value] => 222
        [date] => 'today'
    )
[2] => Array
    (
        [id] => 3
        [value] => 333
        [date] => 'today'
    )

(

Answer 1

array_reduce array_values() 解决方案：

$arr = [
    ['id' => 1, 'value' => 111, 'date'=> 'today'],
    ['id' => 2, 'value' => 222, 'date'=> 'today'],
    ['id' => 3, 'value' => 333, 'date'=> 'today'],
    ['id' => 1, 'value' => 111, 'date'=> 'today'],
    ['id' => 5, 'value' => 111, 'date'=> 'today']
    ];
$result = array_values(
    array_reduce($arr, function($r, $a){
        if (!isset($r[$a['value'] . $a['date']])) $r[$a['value'] . $a['date']] = $a;
        return $r;
    }, [])
);
print_r($result);

输出：

Array
(
    [0] => Array
        (
            [id] => 1
            [value] => 111
            [date] => today
        )
    [1] => Array
        (
            [id] => 2
            [value] => 222
            [date] => today
        )
    [2] => Array
        (
            [id] => 3
            [value] => 333
            [date] => today
        )
)

Answer 2

在您的数组上迭代，并获取键作为'date'和'value'字段的串联。如果已经找到此键 - 跳过数组值：

$pairs = [];
$new_values = [];
foreach ($array as $item) {
    $key = $item['date'] . $item['value'];
    if (empty($pairs[$key])) {
        $pairs[$key] = 1;
        $new_values[] = $item;
    }
}