rot13.php

<?php
##
## This code is licensed under the GPL-v3
## Belongs to the "encrypt" system that can be found here:
## https://github.com/CaeSpock/encrypt
## Questions and suggestions are always welcomed. Send me an E-Mail at: CAnibarro<at>WhiteSith<dot>com
##

  // Cesar cipher Type 1 - K=13
  // ROT-13 aka ROT13
  echo "<div class=\"table-responsive\">\n";
  echo "<table class=\"table table-sm\">\n";
  echo "<tr>\n";
  echo " <td class=\"table-dark text-right\">$l_type:</td>\n";
  echo " <td>$l_rot13</td>\n";
  echo "</tr>\n";
  echo "<tr>\n";
  echo " <td class=\"table-dark text-right\">$l_alphabet:</td>\n";
  echo " <td><pre>";
  for ($i=65; $i<=90; $i++) {
    echo chr($i);
  }
  echo "</pre></td>\n";
  echo "</tr>\n";
  echo "<tr>\n";
  echo " <td class=\"table-dark text-right\">$l_newalphabet:</td>\n";
  echo " <td><pre>";
  for ($i=65; $i<=90; $i++) {
    $position=$i;
    if ($i>65+12) { $position=$i-26; }
    $letter=$position+13;
    echo chr($letter);
  }
  echo "</pre></td>\n";
  echo "</tr>\n";
  echo "<tr>\n";
  echo " <td class=\"bg-warning text-right\"><strong>$l_phrase:</strong></td>\n";
  echo " <td><pre>$phrase</pre></td>";
  echo "</tr>\n";
  echo "<tr>\n";
  echo " <td class=\"bg-success text-right\"><strong>$l_newphrase:</strong></td>\n";
  echo " <td><pre>";
  $counter=0;
  while ($counter < strlen($phrase)) {
    $position = ord($phrase[$counter]);
    if ($position >=65 and $position<=90) {
      if ($position > 65+12) {
        $position=$position-13;
      } else {
        $position=$position+13;
      }
    }
    echo chr($position);
    $counter++;
  }
  echo "</pre></td>\n";
  echo "</tr>\n";
  echo "</table>\n";
  echo "</div>\n";
  echo "<br /><br />";
  echo "<div class=\"text text-center\">\n";
  echo "<a href=\"$phpself\" class=\"btn btn-secondary\" role=\"button\">$l_goback</a>\n";
  echo "</div>";