为什么array_values比foreach更好? [英] Why array_values is better than a foreach?

问题描述

为什么 array_values()优于foreach循环来重新索引数组?

Why array_values() is better than a foreach loop to re-index an array?

示例1:

$arrays = [
  1 => '0',
  2 => '1',
  3 => '2',
  4 => '3',
  5 => '',
  6 => '',
  7 => '7',
  8 => [
    0 => 'toto',
    1 => 'manu',
    2 => 'noé',
    3 => 'david'
  ]
];

$arrayNonAssoc = [];
foreach ($arrays as $array) {
     $arrayNonAssoc[] = $array;
}

因此，示例1 是不执行的错误，并且...

So the Example 1 is the error to not do and...

示例2:

$arrays = [
  1 => '0',
  2 => '1',
  3 => '2',
  4 => '3',
  5 => '',
  6 => '',
  7 => '7',
  8 => [
    0 => 'toto',
    1 => 'manu',
    2 => 'noé',
    3 => 'david'
  ]
];

var_dump(array_values($arrays));

我已阅读过有关此内容的信息，但未发现任何相关说明.示例1 和示例2 返回相同的结果...

I have read about it, but I didn't found any explications to this. Both Example 1 and Example 2 return the same result...

与性能有关吗?

推荐答案

1. 更少的代码.
2. 更容易理解的代码，因为这正是 array_values 的用途，但是您的 foreach 可以做任何事情，除非您阅读并理解它.
3. array_values 是在后台用C语言实现的本机PHP函数，其性能可能比自定义PHP代码高得多.

1. Less code.
2. Easier to understand code, because that's exactly what array_values is for, yet your foreach could do anything unless you read and understand it.
3. array_values is a native PHP function implemented in C behind the scenes, and likely much more performant than custom PHP code.

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