在PHP中反转字符串中的数字[关闭]

Question

I have a UTF8 string that contains letters and digits. For example:

"Hello World 37. What? 24 last 6650"

and I want to reverse only the digits but keep the numbers in the same place. The output should be:

"Hello World 73. What? 42 last 0566"

Answer 1

echo preg_replace_callback('/\d+/', function (array $m) { return strrev($m[0]); }, $string);