PHP按键合并数组答案

【问题标题】：PHP merge array by keysPHP按键合并数组
【发布时间】：2014-03-02 16:58:11
【问题描述】：

我有 2 个数组。

商品数组和分隔符数组。

$goods = [
    [
        'good_id' => '1',
        'name' => 'Good 1',
    ],
    [
        'good_id' => '24',
        'name' => 'Good 24',
    ],
    [
        'good_id' => '335',
        'name' => 'Good 335',
    ],
    [
        'good_id' => '1986',
        'name' => 'Good 1986',
    ],
];

$separators = [
    [
        'id' => '1',
        'good_id' => '0',
        'name' => 'Separator 1',
    ],
    [
        'id' => '2',
        'good_id' => '0',
        'name' => 'Separator 2',
    ],
    [
        'id' => '3',
        'good_id' => '4',
        'name' => 'This separator should set after 4 good_id and before 5 good_id if exists',
    ],
    [
        'id' => '4',
        'good_id' => '47',
        'name' => 'This separator should set after 47 good_id and before 48 good_id if exists',
    ],
    [
        'id' => '5',
        'good_id' => '9999',
        'name' => 'This separator should set after 9999 good_id and before 10000 good_id if exists',
    ],
    [
        'id' => '6',
        'good_id' => '9999',
        'name' => 'This separator should set after 9999 good_id and AFTER prevously separator AND before 10000 good_id if exists',
    ]

];

我需要通过 good_id 合并这些数组。 Spearators good_id 应该在good_id 之后设置good_id。

$merged = [
    [
        'id' => '1',
        'good_id' => '0',
        'name' => 'Separator 1',
    ],
    [
        'id' => '2',
        'good_id' => '0',
        'name' => 'Separator 2',
    ],
    [
        'good_id' => '1',
        'name' => 'Good 1',
    ],
    [
        'id' => '3',
        'good_id' => '4',
        'name' => 'This separator should set after 4 good_id and before 5 good_id if exists',
    ],
    [
        'good_id' => '24',
        'name' => 'Good 24',
    ],
    [
        'id' => '4',
        'good_id' => '47',
        'name' => 'This separator should set after 47 good_id and before 48 good_id if exists',
    ],
    [
        'good_id' => '335',
        'name' => 'Good 335',
    ],
    [
        'good_id' => '1986',
        'name' => 'Good 1986',
    ],
    [
        'id' => '5',
        'good_id' => '9999',
        'name' => 'This separator should set after 9999 good_id and before 10000 good_id if exists',
    ],
    [
        'id' => '6',
        'good_id' => '9999',
        'name' => 'This separator should set after 9999 good_id and AFTER prevously separator AND before 10000 good_id if exists',
    ]

];

【问题讨论】：

标签： php merge

【解决方案1】：

据我了解，您需要合并两个数组并按good_id 子键对结果进行排序。假设这些数组没有具有相同 good_id 键的记录，您可以使用这个简单的解决方案：

$merged = array_merge($goods, $separators);
usort($merged, function ($a, $b) {
    return $a['good_id'] < $b['good_id']? -1 : 1;
});

【讨论】：

usort 不返回数组。