Just PHP FUN 143.

hamming_code.php

<?php
# https://www.codewars.com/kata/5ef9ca8b76be6d001d5e1c3e Error correction #1 - Hamming Code.
function encode($text){
  if(empty($text)) return '';
  $a = str_split($text);
  return implode(array_map('chr2code',$a));
}
function chr2code($chr){
  $chr = str_pad(decbin(ord($chr)),8,"0",STR_PAD_LEFT);
  $answer = "";
  for($i = 0; $i < strlen($chr) ; $i += 1) $answer .= str_repeat($chr[$i],3); 
  return $answer;
}

function decode($bits){
  $single_bit = "";
  for($i = 2; $i < strlen($bits); $i += 3){
    $x = [$bits[$i-2],$bits[$i-1],$bits[$i]];
    $z = array_count_values($x);
    if(2 <= $z['1']){ $single_bit .= '1'; }
    else{ $single_bit .= "0";}
  }
  $arr = [];
  for($i = 0; $i < strlen($single_bit); $i += 1){
    if(0 == $i%8) array_push($arr,"");
    $arr[count($arr) - 1] .= $single_bit[$i];
  }
  $arr = array_map(fn($x) => chr(bindec($x)), $arr);
  return implode($arr);
}

just_php_fun_143.md

Just PHP FUN 143.

• https://www.codewars.com/kata/5ef9ca8b76be6d001d5e1c3e Error correction #1 - Hamming Code.

Started at 23:56 02.11.2020 Monday Nov.
Finished at 23:35 03.11.2020 Tuesday Nov. (23hrs 39minutes)