Just PHP FUN 075.

just_php_fun_075.md

Just PHP FUN 075.

• https://www.codewars.com/kata/56fcc393c5957c666900024d Coding with Squared Strings.
• https://www.codewars.com/kata/56dbf59b0a10feb08c000227 Moves in squared strings (IV)

Started at 20:41 at 13.08.2020 Aug Thursday.
Finished at 1:45 at 14.08.2020 Aug Fridea. (5hrs 4minutes)

rotate_90_and_diag2sym.php

<?php
# https://www.codewars.com/kata/56dbf59b0a10feb08c000227 Moves in squared strings (IV)
function rot90Counter($s) {
    $arr = str2arr($s); $n = count($arr); $ans = arr_new($n);
    for($i = 0; $i < $n; $i += 1) for($j = 0; $j < $n; $j += 1)
      $ans[$i][$j] = $arr[$j][$n - $i - 1];
    return arr2str($ans);
}
function diag2Sym($s) {
    $arr = str2arr($s); $n = count($arr); $ans = arr_new($n);
    for($i = 0; $i < $n; $i += 1) for($j = 0; $j < $n; $j += 1)
      $ans[$i][$j] = $arr[$n - $j - 1][$n - $i - 1];
    return arr2str($ans);
}
function selfieDiag2Counterclock($s) {
    $s0 = explode("\n",$s); 
    $s1 = explode("\n",diag2Sym($s)); 
    $s2 = explode("\n",rot90Counter($s)); 
    return implode("\n",array_map(
      function($a,$b,$c){return $a."|".$b."|".$c;}
      ,$s0,$s1,$s2));
}
function oper($fct, $s) {
    return call_user_func($fct,$s);
}

function str2arr($s){ return array_map('str_split',explode("\n",$s));}
function arr_new($n){ return array_map(
  function($x) use($n){ return array_fill(0,$n,' ');}
  ,array_fill(0,$n,' '));}
function arr2str($a){ return implode("\n",array_map('implode',$a));}

square_strings.php

<?php
# https://www.codewars.com/kata/56fcc393c5957c666900024d Coding with Squared Strings.
function create_array($n){
  return array_map(function($x) use($n){ return array_fill(0,$n,chr(11));},array_fill(0,$n,0));
}

function code($s) {
    $n = ceil(sqrt(strlen($s)));
    $arr = create_array($n);
    $s = str_split($s);
    foreach($s as $k=>$v) $arr[floor(($k - $k%$n)/$n)][$k%$n] = $v;
    $rotated = create_array($n);
    for($i = 0; $i < $n; $i+=1) for($j = 0; $j < $n; $j+=1) $rotated[$i][$j] = $arr[$n - 1 - $j][$i];
    return implode("\n",array_map('implode',$rotated));
}

function decode($s) {
    $arr = array_map('str_split',explode("\n",$s));
    $n = count($arr);
    $ans = "";
    for($i = 0; $i < $n; $i+=1) for($j = 0; $j < $n; $j+=1) $ans .=  $arr[$j][$n - 1 - $i];
    return trim($ans,chr(11));
}