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  1. <?php
  2. $input = 'aaaabbcccff';
  3. $acv = array_count_values(str_split($input));
  4. arsort($acv);
  5. $arr = [];
  6. foreach($acv as $key=>$value)
  7.   $arr[] = str_split(str_repeat($key, $value));
  8. $out = null;
  9.  for($i=0; $i<count($arr[0]); $i++)
  10.   for($j=0; $j<count($arr); $j++)
  11.     $out.= isset($arr[$j][$i]) ? $arr[$j][$i] : null;
  12.  
  13. echo 'Input: '.$input.PHP_EOL.'Out: '.$out;
Success #stdin #stdout 0.02s 52472KB
comments (?)
stdin
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Standard input is empty
stdout
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Input: aaaabbcccff
Out: acfbacfbaca
https://ideone.com/7PU9VB
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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