php - 如何在 PHP 中对数组进行分组？

Question

如何按 houseid 对该数组进行分组？

Array
(
    [0] => stdClass Object
        (
            [id] => 1111
            [houseid] => 58
            [price] => 2995
        )

    [1] => stdClass Object
        (
            [id] => 1112
            [houseid] => 58
            [price] => 4050
        )

    [2] => stdClass Object
        (
            [id] => 1114
            [houseid] => 60
            [price] => 1695
        )

    [3] => stdClass Object
        (
            [id] => 1115
            [houseid] => 60
            [price] => 2250
        )

    [4] => stdClass Object
        (
            [id] => 1116
            [houseid] => 60
            [price] => 2295
        )
)

我需要计算一个 houseid 的总价并做一些数学/条件，如果将这个数组分组会很容易......

我可以把这个数组格式化成类似的东西吗

Array
(
    [58] => stdClass Object(
        [0] => stdClass Object
        (
            [id] => 1111
            [price] => 2995
        )
        [1] => stdClass Object
        (
            [id] => 1112
            [houseid] => 58
            [price] => 4050
        )
    )
    [60] => stdClass Object(
        [0] => stdClass Object(
            [id] => 1114
            [price] => 1695
        )
        [1] => stdClass Object
        (
            [id] => 1115
            [price] => 2250
        )
        [2] => stdClass Object
        (
            [id] => 1116
            [price] => 2295
        )
)

或者任何人都可以建议我，如何循环原始数组来计算房子的总价格？

Answer 1

您可以使用array_reduce

$data = array_reduce($data, function ($a, $b) {
    $id = $b->houseid;
    unset($b->houseid);
    $a[$id][] = $b;
    return $a;
});

var_dump($data);

输出

array (size=2)
  58 => 
    array (size=2)
      0 => 
        object(stdClass)[1]
          public 'id' => int 1111
          public 'price' => int 2995
      1 => 
        object(stdClass)[2]
          public 'id' => int 1112
          public 'price' => int 4050
  60 => 
    array (size=3)
      0 => 
        object(stdClass)[3]
          public 'id' => int 1114
          public 'price' => int 1695
      1 => 
        object(stdClass)[4]
          public 'id' => int 1115
          public 'price' => int 2250
      2 => 
        object(stdClass)[5]
          public 'id' => int 1116
          public 'price' => int 2295

完整的现场演示