使用匿名函数进行字母排序的比较器函数 [英] Comparator functions for alphabetic sorting with anonymous functions

问题描述

我有一个二维数组，想按名称对其进行排序.我想将 usort() 与匿名函数一起使用.当我想按字母顺序排序时，我的比较器函数应该是什么样的?

I have a two-dimensional array and want to sort it by name. I would like to use usort() with anonymous functions. How should my comparator function look like when I want to sort something alphabetically?

[names] => Array
(
    [0] => Array
        (
            [name] => Baba
            [prename] => Ali
        )

    [1] => Array
        (
            [name] => Pan
            [prename] => Peter
        )

)

为了排序，我试过这个:

To sort, I tried this:

usort($names, function cmp($a, $b) {
    return strcmp($a['name'], $b['name']);
});

这给了我 意外的 T_STRING，在第一行期待 ​​'('.

推荐答案

bug 不是那么明显，但是再次思考匿名函数的概念，我得到了提示.函数名不能存在.我的确切问题的正确解决方案是

The bug was not so obvious, but thinking again about the concept of anonymous functions, I got the hint. The function name can't be there. The correct solution for my exact problem is

usort($names, function ($a, $b) {
    return strcmp($a['name'], $b['name']);
});

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