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  1. <?php
  2.  
  3. $str = '(123*1.23*(0.12/8))*(123*512+40)';
  4.  
  5. $depth = 0;
  6. for ($i = 0; $i < strlen($str); ++$i) {
  7.     $char = $str[$i];
  8.  
  9.     switch ($char) {
  10.         case '(':
  11.             ++$depth;
  12.             break;
  13.         case ')':
  14.             --$depth;
  15.             break;
  16.         case '*':
  17.             if ($depth != 0) {
  18.                 $str = substr_replace($str, '||', $i, 1);
  19.                 ++$i;
  20.             }
  21.             break;
  22.     }
  23. }
  24.  
  25. echo $str;
Success #stdin #stdout 0.01s 20568KB
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(123||1.23||(0.12/8))*(123||512+40)
https://ideone.com/IOpOl9
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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