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  1. <?php
  2.  
  3. function PermutationsRep ($alphabet, $return, $result=[], $pos=0) {
  4.  if ($pos == count ($alphabet))
  5.    $return($result);
  6.  else
  7.  foreach ($alphabet as $char) {
  8.    $result[$pos]=$char;
  9.    PermutationsRep ($alphabet, $return, $result, $pos+1);
  10.  }
  11. }
  12.  
  13. PermutationsRep (['a','b','c'], function ($p){
  14.   echo implode('',$p), PHP_EOL;
  15. });
  16.  
Success #stdin #stdout 0.01s 20520KB
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stdin
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Standard input is empty
stdout
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aaa
aab
aac
aba
abb
abc
aca
acb
acc
baa
bab
bac
bba
bbb
bbc
bca
bcb
bcc
caa
cab
cac
cba
cbb
cbc
cca
ccb
ccc
https://ideone.com/TimRl3
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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