PHP，排序，sort_flags [英] PHP, sort, sort_flags

问题描述

我正在此页面上研究 sort_flags .在PHP手册上.

I am studying sort_flags at this page on PHP Manual.

我不明白这些标志分别代表什么区别.

And I don't understand what difference each of these flags represents.

只有6个标志，有人可以帮助我了解它们之间的区别吗?也许有一些例子.我会非常感激.

There are only 6 flags, can someone please help me to understand the difference between them. Maybe with some examples. I would be very thankful.

推荐答案

用于测试的数组:

$toSort = array(2, 1, "img1", "img2", "img10", 1.5, "3.14", "2.72");

请注意， 3.14&2.72 是字符串.

使用 SORT_REGULAR 标志(通常比较项目):

Using SORT_REGULAR flag (compare items normally):

Array
(
    [0] => 2.72
    [1] => 3.14
    [2] => img1
    [3] => img10
    [4] => img2
    [5] => 1
    [6] => 1.5
    [7] => 2
)

使用 SORT_NUMERIC 标志(以数字方式比较项目，因此 3.14 以数字而不是字符串进行排序):

Using SORT_NUMERIC flag (compare items numerically, so 3.14 is sorted as number not a string):

Array
(
    [0] => img10
    [1] => img1
    [2] => img2
    [3] => 1
    [4] => 1.5
    [5] => 2
    [6] => 2.72
    [7] => 3.14
)

使用 SORT_STRING 标志( SORT_LOCALE_STRING 的工作原理类似，但取决于当前的语言环境，所有值都视为字符串):

Using SORT_STRING flag (SORT_LOCALE_STRING works similary, but depends on current locale, all values are treated as strings):

Array
(
    [0] => 1
    [1] => 1.5
    [2] => 2
    [3] => 2.72
    [4] => 3.14
    [5] => img1
    [6] => img10
    [7] => img2
)

使用 SORT_NATURAL 标志(注意 img * 字符串的顺序，它是自然的):

Using SORT_NATURAL flag (note order of img* strings, it is natural):

Array
(
    [0] => 1
    [1] => 1.5
    [2] => 2
    [3] => 2.72
    [4] => 3.14
    [5] => img1
    [6] => img2
    [7] => img10
)

SORT_FLAG_CASE 可以与 SORT_STRING 或 SORT_NATURAL 组合以进行不区分大小写的排序，例如:

SORT_FLAG_CASE can be combined with SORT_STRING or SORT_NATURAL to do case-insensitive sort e.g.:

// works like SORT_NATURAL but is case-insensitive
sort($toSort, SORT_NATURAL | SORT_FLAG_CASE);

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