Laravel系列:使用完整的关键名称展平

时间:2017-05-10 08:28:21

标签: laravel laravel-5 laravel-5.4 laravel-collection

Laravel Collections是否有办法使用键“命名空间”展平数组。类似的东西:

$a = collect([
    'id' => 1,
    'data' => [
        'a' => 2,
        'b' => 3
    ]
]);

$a = $a->flattenWithKeysNamespace(); // <-- this does not exists

// Should returns: 
// ['a' => 1, 'data.b' => 2, 'data.c' => 3]; // <-- I would like this.

我知道我可以在原始PHP中执行此操作,或者使用Collection函数的某些程序集,但有时我会错过Laravel Collection文档中的内容。那么使用Collection函数有一个简单的方法吗?

1 个答案:

答案 0 :(得分:0)

如果您不关心转换的深度级别,我认为最简单的选择就是array_dot辅助函数。如果你想更精细地控制递归的深度,以及是否有点分隔的数组键,我已经编写了一个可以做到这一点的集合宏。通常collect($array)->collapse()维护字符串键,但非增量数字键仍然会丢失,即使类型强制为字符串。我最近需要维护它们。

将其放入AppServiceProvider::boot()方法:

    /**
     * Flatten an array while keeping it's keys, even non-incremental numeric ones, in tact.
     *
     * Unless $dotNotification is set to true, if nested keys are the same as any
     * parent ones, the nested ones will supersede them.
     *
     * @param int $depth How many levels deep to flatten the array
     * @param bool $dotNotation Maintain all parent keys in dot notation
     */
    Collection::macro('flattenKeepKeys', function ($depth = 1, $dotNotation = false) {
        if ($depth) {
            $newArray = [];
            foreach ($this->items as $parentKey => $value) {
                if (is_array($value)) {
                    $valueKeys = array_keys($value);
                    foreach ($valueKeys as $key) {
                        $subValue = $value[$key];
                        $newKey = $key;
                        if ($dotNotation) {
                            $newKey = "$parentKey.$key";
                            if ($dotNotation !== true) {
                                $newKey = "$dotNotation.$newKey";
                            }

                            if (is_array($value[$key])) {
                                $subValue = collect($value[$key])->flattenKeepKeys($depth - 1, $newKey)->toArray();
                            }
                        }
                        $newArray[$newKey] = $subValue;
                    }
                } else {
                    $newArray[$parentKey] = $value;
                }
            }

            $this->items = collect($newArray)->flattenKeepKeys(--$depth, $dotNotation)->toArray();
        }

        return collect($this->items);
    });

然后,您可以致电collect($a)->flattenKeepKeys(1, true);并取回您期待的内容。