Revision f15a1307-1ec4-4093-88ab-aa2b6a3ff3a5 - Code Golf Stack Exchange

PHP7.4 (79 chars)
-

The function **$f** is inverting the last two chars of every word.

```php
$f=fn($s)=>preg_replace_callback('#(\S)(\S)($|\s)#u',fn($a)=>"$a[2]$a[1] ",$s);
```
Usage :
```php
echo $f('Flippign Lettesr Aroudn');
```