Just PHP FUN 120.

just_php_fun_120.md

Just PHP FUN 120.

• https://www.codewars.com/kata/5508249a98b3234f420000fb First Variation on Caesar Cipher.

Started at 20:45 05.10.2020 Monday Oct.
Finished at 22:02 05.10.2020 Monday Oct. (1hr 17minutes)

movingShift.php

<?php 
// https://www.codewars.com/kata/5508249a98b3234f420000fb First Variation on Caesar Cipher. 
function movingShift($s, $shift) {
  $ch2n = ['A'=>1,'B'=>2,'C'=>3,'D'=>4,'E'=>5,'F'=>6,'G'=>7,'H'=>8,'I'=>9,'J'=>10,'K'=>11,'L'=>12,'M'=>13,'N'=>14,'O'=>15,'P'=>16,'Q'=>17,'R'=>18,'S'=>19,'T'=>20,'U'=>21,'V'=>22,'W'=>23,'X'=>24,'Y'=>25,'Z'=>26,];
  $n2ch = [1=>'A',2=>'B',3=>'C',4=>'D',5=>'E',6=>'F',7=>'G',8=>'H',9=>'I',10=>'J',11=>'K',12=>'L',13=>'M',14=>'N',15=>'O',16=>'P',17=>'Q',18=>'R',19=>'S',20=>'T',21=>'U',22=>'V',23=>'W',24=>'X',25=>'Y',26=>'Z',];
  $a = str_split($s);
  $up = upcase_map($a);
  $a = str_split(strtoupper($s));
  foreach($a as $k=>$v){
    if(preg_match('/[A-Z]/', $v)){
      $v = $n2ch[(($ch2n[$v] - 1) + $shift)%26 + 1];
      $a[$k] = $v;
    }
     $shift = ($shift + 1) %26;
  }
  $ans = crstr($a,$up);
  $ret = splitter($ans);
  return $ret;
}
function demovingShift($arr, $shift) {
  $ch2n = ['A'=>1,'B'=>2,'C'=>3,'D'=>4,'E'=>5,'F'=>6,'G'=>7,'H'=>8,'I'=>9,'J'=>10,'K'=>11,'L'=>12,'M'=>13,'N'=>14,'O'=>15,'P'=>16,'Q'=>17,'R'=>18,'S'=>19,'T'=>20,'U'=>21,'V'=>22,'W'=>23,'X'=>24,'Y'=>25,'Z'=>26,];
  $n2ch = [1=>'A',2=>'B',3=>'C',4=>'D',5=>'E',6=>'F',7=>'G',8=>'H',9=>'I',10=>'J',11=>'K',12=>'L',13=>'M',14=>'N',15=>'O',16=>'P',17=>'Q',18=>'R',19=>'S',20=>'T',21=>'U',22=>'V',23=>'W',24=>'X',25=>'Y',26=>'Z',];
  $a = str_split(implode($arr));
  $up = upcase_map($a);
  $a = str_split(strtoupper(implode($arr)));
  
  foreach($a as $k=>$v){
    if(preg_match('/[A-Z]/', $v)){
      $v = $n2ch[( 26 + ($ch2n[$v] - 1) - $shift)%26 + 1];
      $a[$k] = $v;
    }
     $shift = ($shift + 1) %26;
  }
  
  $ans = crstr($a,$up);
  return $ans;
}


function upcase_map($a){
  return array_map(function($x){ 
    return (bool) preg_match('/[A-Z]/',$x);},$a);
}
function crstr($a,$up){
  $ans = "";
  foreach($a as $k => $v){
    if(!$up[$k]) $v = strtolower($v);
    $ans .= $v;
  }
  return $ans;
}
function splitter($str){
  $chunk = ceil(strlen($str)/5);
  $ans = [];
  while(strlen($str) >= $chunk) {
    $ans[] = substr($str,0,$chunk);
    $str = substr($str,$chunk);
  }
  if(strlen($str) > 0) $ans[] = $str;
  while(count($ans) < 5) $ans[] = "";
  
  return $ans;
}