通过对PHP中的多维数组进行分组计数 [英] Count by grouping Multidimensional arrays in PHP

问题描述

可能重复：

php如何按特定值对多维数组进行分组？

php group by SUM using multi dimensional array

我需要一些帮助，通过基于php

I need some help in getting the count of the array element quantity by grouping it based on a date value part of a Multidimensional array in php

这是我的原始数组

Array
(
[0] => Array
    (
        [quantity] => 5
        [dd] => 01-Nov-2012
    )

[1] => Array
    (
        [quantity] => 10
        [dd] => 01-Nov-2012
    )

[2] => Array
    (
        [quantity] => 3
        [dd] => 02-Nov-2012
    )

[3] => Array
    (
        [quantity] => 4
        [dd] => 03-Nov-2012
    )

[3] => Array
    (
        [quantity] => 15
        [dd] => 03-Nov-2012
    )
)

这是我期望的输出

Array
(
[0] => Array
    (
        [quantity] => 15
        [dd] => 01-Nov-2012
    )

[1] => Array
    (
        [quantity] => 3
        [dd] => 02-Nov-2012
    )

[2] => Array
    (
        [quantity] => 19
        [dd] => 03-Nov-2012
    )
)

任何帮助将非常感谢:)

提前感谢

Any help would greatly appreciated :)
Thanks in advance

推荐答案

只需循环处理行，然后将数量累加到不同的数组由 dd 值索引。

Just loop trough the rows, and add up the quantities in a different array indexed by the dd values.

$in = array(array()); // your input
$out = array();
foreach ($in as $row) {
    if (!isset($out[$row['dd']])) {
        $out[$row['dd']] = array(
            'dd' => $row['dd'],
            'quantity' => 0,
        );
    }
    $out[$row['dd']]['quantity'] += $row['quantity'];
}
$out = array_values($out); // make the out array numerically indexed
var_dump($out);

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