按多维数组和计数值分组答案

【问题标题】：Group by multidimensional array and count values按多维数组和计数值分组
【发布时间】：2016-12-22 10:26:06
【问题描述】：

我有这样的数组

[
    (int) 0 => [
        'Servloc' => '1',
        'WasteText' => 'Container1',
        'ContainerText' => 'Container Type 1',
        'ContainerCount' => (int) 5,
    ],
    (int) 1 => [
        'Servloc' => '1',
        'WasteText' => 'Container1',
        'ContainerText' => 'Container Type 1',
        'ContainerCount' => (int) 4,
    ],
    (int) 2 => [
        'Servloc' => '1',
        'WasteText' => 'Container1',
        'ContainerText' => 'Container Type 1',
        'ContainerCount' => (int) 3,
    ],
    (int) 3 => [
        'Servloc' => '1',
        'WasteText' => 'Container2',
        'ContainerText' => 'Container Type 1',
        'ContainerCount' => (int) 3,
    ],
    (int) 4 => [
        'Servloc' => '2',
        'WasteText' => 'Container1',
        'ContainerText' => 'Container Type 2',
        'ContainerCount' => (int) 1,
    ],  
]

我需要根据 Servloc、WasteText、ContainerText 的相同值加上 ContainerCount 中的所有值对这个数组进行分组。

所以这个数组的结果应该是：

[
    (int) 0 => [
        'Servloc' => '1',
        'WasteText' => 'Container1',
        'ContainerText' => 'Container Type 1',
        'ContainerCount' => (int) 12,
    ],
    (int) 3 => [
        'Servloc' => '1',
        'WasteText' => 'Container2',
        'ContainerText' => 'Container Type 1',
        'ContainerCount' => (int) 3,
    ],
    (int) 4 => [
        'Servloc' => '2',
        'WasteText' => 'Container1',
        'ContainerText' => 'Container Type 2',
        'ContainerCount' => (int) 1,
    ],  
]

我尝试过两次 foreach 第一个数组并比较这些值，如果它们相同，则放入另一个数组作为结果。但它不起作用....

【问题讨论】：

标签： php multidimensional-array

【解决方案1】：

试试这个：

function groupArray($data) {
    $keys = array();

    foreach ($data as $child) {
        $key = $child['Servloc'] . $child['WasteText'] . $child['ContainerText'];

        if(!array_key_exists($key, $keys)) {
            // check if we already found objects with the same data, if not then we start with 0 as containercount
            $keys[$key] = array(
                'Servloc' => $child['Servloc'],
                'WasteText' => $child['WasteText'],
                'ContainerText' => $child['ContainerText'],
                'ContainerCount' => 0,
            );
        }

        $keys[$key]['ContainerCount'] += $child['ContainerCount'];
    }

    return array_values($keys);
}

【讨论】：