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  1. <?php
  2.  
  3. $output = '';
  4. $input = str_split('123456');
  5. $length = count($input);
  6.  
  7. while(strlen($output) < $length) {
  8.     $currLength = strlen($output);
  9.     if($currLength % 2 === 1) {
  10.         $output .= array_shift($input);
  11.     }
  12.     else {
  13.         $output .= array_pop($input);
  14.     }
  15. }
  16.  
  17. echo $output;
Success #stdin #stdout 0.02s 24448KB
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Standard input is empty
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615243
https://ideone.com/Xyd0z6
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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