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  1. <?php
  2.  
  3. $input = '1ab2v3g4de';
  4. $length = \strlen($input);
  5. $output = '';
  6.  
  7. for ($i = $length - 1; $i >= 0; --$i) {
  8. $output .= $input[$i];
  9. }
  10.  
  11. \var_dump($output);
Success #stdin #stdout 0s 82560KB
stdin
Standard input is empty
stdout
string(10) "ed4g3v2ba1"