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php rot13

Basic rot13 function for PHP (remember that this is NOT secure encryption!).
It's built into php nowadays, but if you have an old version you may not.

  1. // Rot 13 function for older php versions
  2. function rot13($text){
  3.         $length = strlen($text);
  4.         $newtext = '';
  5.          for($i = 0; $i < $length; $i++){
  6.                  $index = ord($text[$i]);
  7.                  // Rotate upper case.
  8.                  if($index > 64 && $index < 91){
  9.                          $index += 13;
  10.                          if($index > 90) $index -= 26;
  11.                          $newtext .= chr($index);
  12.                 // Rotate lower case.
  13.                 }elseif($index > 96 && $index < 123){
  14.                         $index += 13;
  15.                         if($index > 122) $index -= 26;
  16.                         $newtext .= chr($index);
  17.                  }else{ $newtext .= $text[$i]; }
  18.          }
  19.          return $newtext;
  20. }
Display clean php code for copying
// Rot 13 function for older php versions
function rot13($text){
	$length = strlen($text);
	$newtext = '';
	 for($i = 0; $i < $length; $i++){
		 $index = ord($text[$i]);
		 // Rotate upper case.
		 if($index > 64 && $index < 91){
			 $index += 13;
			 if($index > 90) $index -= 26;
			 $newtext .= chr($index);
		// Rotate lower case.
		}elseif($index > 96 && $index < 123){
			$index += 13;
			if($index > 122) $index -= 26;
			$newtext .= chr($index);
		 }else{ $newtext .= $text[$i]; }
	 }
	 return $newtext;
}
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