如何实现基于连字符分隔的子字符串的多个自定义排序规则? [英] How to implement multiple custom sorting rules based on hyphen-delimited substrings?

问题描述

我有以下格式的文件名数组:

I have an array of filenames of this form:

"A-1.2-平面图.PDF"

"A - 1.2 - Floor Plan.PDF"

我需要首先按照类别按以下顺序对数组进行排序:

I need to sort the array first by the category at the beginning, in the following order:

1. Category: A
2. Category: ESC
3. Category: C
4. Category: M
5. Category: E
6. Category: P

然后，我需要按照类别后面的数字对数组进行排序.

Then I need to sort the array by the numbers following the category.

这是要排序的数组的示例:

Here's an example of the array to be sorted:

$arr[0] = "A - 1.0 - Title Page.PDF";
$arr[1] = "A - 2.2 - Enlarged Floor Plans";
$arr[2] = "A - 2.1.0 - Structural Details.PDF";
$arr[3] = "E - 1.0 - Electrical Title Page.PDF";
$arr[4] = "A - 1.2 - Floor Plan.PDF";
$arr[5] = "P - 1.0 - Plumbing Title Page.PDF";
$arr[6] = "A - 2.1.1 - Structural Details.PDF";
$arr[7] = "C - 1.0 - Civil Title Page.PDF";
$arr[8] = "M - 1.0 - Mechanical Title Page.PDF";
$arr[9] = "ESC - 1.0 - Erosion Control Plan.PDF";

理想情况下，此数组将变为

Ideally, this array would then become

$arr[0] = "A - 1.0 - Title Page.PDF";
$arr[1] = "A - 1.2 - Floor Plan.PDF";
$arr[2] = "A - 2.1.0 - Structural Details.PDF";
$arr[3] = "A - 2.1.1 - Structural Details.PDF";
$arr[4] = "A - 2.2 - Enlarged Floor Plans";
$arr[5] = "ESC - 1.0 - Erosion Control Plan.PDF";
$arr[6] = "C - 1.0 - Civil Title Page.PDF";
$arr[7] = "M - 1.0 - Mechanical Title Page.PDF";
$arr[8] = "E - 1.0 - Electrical Title Page.PDF";
$arr[9] = "P - 1.0 - Plumbing Title Page.PDF";

我具有以下正则表达式，用于适当地对文件名进行分组:

I have the following regular expression for grouping the file names appropriately:

^([A-Z]+?) ?- ?([0-9]+)\.([0-9]+)(\.([0-9]+))?.*$

我想要按组1，按组2，然后按组3排序的数组.如果存在组5，则最后按组5排序.忽略组4.

I want the array sorted by group 1, then by group 2, then by group 3. If Group 5 exists, then sort last by group 5. Ignore group 4.

按字典顺序对类别进行排序可能会更容易.如果是这样，那没关系；尽管按上述顺序对它们进行排序比较可取.

It may be easier to sort the categories lexicographically. If so, that would be alright; though it would be preferable if they were sorted in the order mentioned above.

有什么办法可以用PHP做到这一点?

Is there any way to do this with PHP?

推荐答案

有sort函数，它以compare方法作为参数.您可以像这样使用它:

There is sort function which takes compare method as an argument. You can use it for example like this:

$order = array('A', 'ESC', 'C', 'M', 'E', 'P'); // order of categories
$order = array_flip($order); // flip order array, it'll look like: ('A'=>0, 'ESC'=>1, ...)

function cmp($a, $b)
{
    global $order;

    $ma = array();
    $mb = array();
    preg_match('/^([A-Z]+?) ?- ?([0-9]+)\.([0-9]+)(?:\.([0-9]+))?.*$/', $a, $ma);
    preg_match('/^([A-Z]+?) ?- ?([0-9]+)\.([0-9]+)(?:\.([0-9]+))?.*$/', $b, $mb);

    if ($ma[1] != $mb[1]) {
        return ($order[$ma[1]] < $order[$mb[1]]) ? -1 : 1;
    }
    if ($ma[2] != $mb[2]) {
        return $ma[2] < $mb[2] ? -1 : 1;
    }
    if ($ma[3] != $mb[3]) {
        return $ma[3] < $mb[3] ? -1 : 1;
    }
    // I've changed a regex a little bit, so the last number is 4th group now
    if (@$ma[4] != @$mb[4]) { 
        return @$ma[4] < @$mb[4] ? -1 : 1;
    }
    return 0;
}
usort($arr, "cmp");

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