Question

我写了一个方法来重新排序数组上的所有数字键。

你可以在下面的代码中看到我有一个带有未排序键的数组。这个键（f.e. 200,2）应该递归地重新排序（f.e.，0,1）。这应该在php 5.6中最多7个，但至少在7

中

完美无缺，但似乎很慢。我想知道是否有人知道如何更快地获得这个。

代码和测试：

function reorderKeysRecursively(array $array)
{
    foreach ($array as $key => &$value) {
        if (is_array($value)) {
            $array[$key] = reorderKeysRecursively($value);
        }
    }
    return array_slice($array, 0);
}

$array = [
    2 => [
        'foo' => 'bar',
        2     => 'baz',
        'bar' => 3,
        33    => [
            55 => [
                2 => [
                    55 => [
                        'foo' => 'bar'
                    ],
                ],
            ],
        ],
        'baz' => 4,
    ],
];

$start = microtime(true);
for ($i = 0; $i < 200000; $i++) {
    reorderKeysRecursively($array);
}
echo "elapsed: " . (microtime(true) - $start) . PHP_EOL;

$expect = json_encode(
    [
        0 => [
            'foo' => 'bar',
            0     => 'baz',
            'bar' => 3,
            1     => [
                0 => [
                    0 => [
                        0 => [
                            'foo' => 'bar',
                        ],
                    ],
                ],
            ],
            'baz' => 4,
        ],
    ]
);
$result = json_encode(reorderKeysRecursively($array));
echo "is expected result: " . (var_export($result === $expect, true)) . PHP_EOL;

感谢您的帮助！ / cottton

Answer 1

方式去（直到有人有更好的解决方案）每个阵列级别都是array_merge。

function reorderKeysRecursively(array &$array)
{
    foreach ($array as $key => &$value) {
        if (is_array($value)) {
            $array[$key] = reorderKeysRecursively($value);
        }
    }
    return array_merge($array);
}

停止

[
    0 => [                  // before: 2
        'foo' => 'bar',
        0     => 'baz',     // before: 2
        'bar' => 3,
        1     => [          // before: 33
            0 => [          // before: 55
                0 => [      // before: 2
                    0 => [  // before: 55
                        'foo' => 'bar',
                    ],
                ],
            ],
        ],
        'baz' => 4,
    ],
]

递归重新排序数组键 - array_slice慢？

1 个答案: