如何将数字反向返回到字符串

Question

我正在练习，我得到了一个程序如何工作的例子

Entry: "Dlasdf234dkl sdfkl8886adaf15adfjk7 asdflkj376661a s445s198"

Output: "Dlasdf432dkl sdfkl6888adaf51adfjk7 asdflkj166673a s544s891"

无论它们在哪里，我都设法得到了所有的数字，我通过爆炸和内爆来做到这一点。我将数字作为字符串，因为我是在循环中完成的，所以我被卡住了，无法将数字取回原始字符串。

当我尝试将它们放回字符串时，我得到了这个混乱：

Array
(
[0] => Array
    (
        [a] => Dlasdf432dkl sdfkl432adaf432adfjk432 asdflkj432a s432s432
        [sub] => Пошаљи
    )

[1] => Array
    (
        [a] => Dlasdf6888dkl sdfkl6888adaf6888adfjk6888 asdflkj6888a s6888s6888
        [sub] => Пошаљи
    )

[2] => Array
    (
        [a] => Dlasdf51dkl sdfkl51adaf51adfjk51 asdflkj51a s51s51
        [sub] => Пошаљи
    )

[3] => Array
    (
        [a] => Dlasdf7dkl sdfkl7adaf7adfjk7 asdflkj7a s7s7
        [sub] => Пошаљи
    )

[4] => Array
    (
        [a] => Dlasdf166673dkl sdfkl166673adaf166673adfjk166673 asdflkj166673a s166673s166673
        [sub] => Пошаљи
    )

[5] => Array
    (
        [a] => Dlasdf544dkl sdfkl544adaf544adfjk544 asdflkj544a s544s544
        [sub] => Пошаљи
    )

[6] => Array
    (
        [a] => Dlasdf891dkl sdfkl891adaf891adfjk891 asdflkj891a s891s891
        [sub] => Пошаљи
    )
)

Answer 1

您需要使用正则表达式来解析数字并替换它们：

<?php

$str = 'Dlasdf234dkl sdfkl8886adaf15adfjk7 asdflkj376661a s445s198';


echo preg_replace_callback('~([0-9]{2,})~', function($matches) { return strrev($matches[1]); }, $str);
// Dlasdf432dkl sdfkl6888adaf51adfjk7 asdflkj166673a s544s891

?>