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  1. <?php
  2.  
  3. function mb_strrev($str){
  4. 	$str = $str[0];
  5.     $isUpper = preg_match('~^\p{Lu}~u', $str);
  6.     $r = '';
  7.     for ($i = mb_strlen($str); $i>=0; $i--) {
  8.         $r .= mb_substr($str, $i, 1);
  9.     }
  10.     return $isUpper ? mb_convert_case($r, MB_CASE_TITLE_SIMPLE ) : $r;
  11. }
  12.  
  13. $text = 'Привет! Давно не виделись.';
  14. $reversed = preg_replace_callback('~[А-Яа-яЁё]+~u', 'mb_strrev', $text);
  15. echo $reversed;
  16.  
Success #stdin #stdout 0.02s 24808KB
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Тевирп! Онвад ен ьсиледив.
https://ideone.com/yGjsp7
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
public

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