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  1. <?php
  2.  
  3. // preg_replace('/('.$txt.')/u', $replacement, $str,1);
  4. $str = "Вася";
  5. $replacement = "н";
  6. $start = 3;
  7. echo mb_substr($str,0,$start-1,"utf8") .
  8.                         $replacement . 
  9.                         mb_substr($str,$start,mb_strlen($str),"utf8");
Success #stdin #stdout 0.03s 52480KB
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Ваня
https://ideone.com/p5MDzP
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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