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  1. <?php
  2.  
  3. function traverse($S, $idx) {
  4.   if ($idx ==  strlen($S)) {
  5.         print_r($S);
  6.         return;
  7.   }
  8.   traverse($S, $idx + 1);
  9.   traverse(substr_replace($S, strtoupper($S[$idx]), $idx, 1), $idx + 1);
  10.   return;
  11. }
  12.  
  13. traverse("abc", 0);
Success #stdin #stdout 0s 82560KB
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stdin
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Standard input is empty
stdout
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abcabCaBcaBCAbcAbCABcABC
https://ideone.com/TUGWa3
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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