array_merge vs array_value用于重置数组索引

I have 1 array that I want to re-index. I have found that both array_values and array_merge functions can do the job (and I don't need 2 arrays for the array_merge function to work).

我有1个数组，我想重新索引。我发现array_values和array_merge函数都可以完成这项工作（我不需要2个数组来使array_merge函数工作）。

Which is faster for a very large array? I would benchmark this, but I don't know how and don't have the large array yet.

对于一个非常大的阵列来说哪个更快？我会对此进行基准测试，但我不知道如何以及没有大阵列。

Before re-index:

在重新索引之前：

Array
(
    [0] => AB
    [4] => EA
    [6] => FA
    [9] => DA
    [10] => AF
)

After re-index:

重新索引后：

Array
(
    [0] => AB
    [1] => EA
    [2] => FA
    [3] => DA
    [4] => AF
)

4 个解决方案

#1

I haven't done the benchmarks either -- and if you need to be sure, you should do them.

我也没有做过基准测试 - 如果你需要确定，你应该这样做。

That said, I would suspect that if one is preferable to the other, array_values() is going to be the way to go.

也就是说，我怀疑如果一个比另一个更好，array_values（）将是要走的路。

After all, what you want to do is exactly what array_values() was designed for.

毕竟，你想要做的就是为array_values（）设计的。

#2

I got the bench mark, array_value is 3x faster (sorry to answer my own question, the comment section does not retain the format)

我得到了替补标记，array_value快了3倍（很遗憾回答我自己的问题，评论部分没有保留格式）

for and array with 8043 elements

for和8043元素的数组

array values took 0.003291130065918 seconds.

数组值花了0.003291130065918秒。

array merge took 0.0096800327301025 seconds.

阵列合并花了0.0096800327301025秒。

$shuf is the un-indexed array

$ shuf是未编入索引的数组

Below is the code for running the benchmark (copied it off the web)

以下是运行基准测试的代码（从网上复制）

    $sha1_start = microtime(true); 
    $arraymerge = array_merge ($shuf); 
    $shal_elapsed = microtime(true) - $sha1_start;


    $start = microtime(true); 
    $arrayvalue = array_values ($shuf); 
    $elapsed = microtime(true) - $start;

echo "<br>array values took $elapsed seconds."; 
echo "<br>array merge took $shal_elapsed seconds.";

#3

array_values is meant to do exactly what you want it to do. array_merge is meant to do something else and you got a workaround to make it work on your case. (although you might have problems if a non-numerical value is forgotten in the indexes).

array_values意味着完全按照您的意愿执行操作。 array_merge意味着要做其他事情，你有一个解决方法，使它适用于你的情况。（尽管如果索引中忘记了非数值，您可能会遇到问题）。

I don't know if there are significant performance differences but for sure code written with array_values is easier to read. And I don't think that a function that is meant to do something is slower than one meant to do something else.

我不知道是否存在显着的性能差异，但确保使用array_values编写的代码更容易阅读。而且我认为用于做某事的函数比用于做其他事情的函数要慢。

Hope this helps.

希望这可以帮助。

#4

It's important to note that array_merge() will only reset the array keys if there are no string keys in the array.

重要的是要注意，如果数组中没有字符串键，array_merge（）将仅重置数组键。

#1