I was reminded again of the desire for a generic str_rot function. Character manipulation loops in PHP are slow compared to their C counterparts, so here's a tuned version of the previous function I posted. It's 1.6 times as fast, mainly by avoiding chr() calls.
<?php
function str_rot($s, $n = 13) {
static $letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$n = (int)$n % 26;
if (!$n) return $s;
if ($n == 13) return str_rot13($s);
for ($i = 0, $l = strlen($s); $i < $l; $i++) {
$c = $s[$i];
if ($c >= 'a' && $c <= 'z') {
$s[$i] = $letters[(ord($c) - 71 + $n) % 26];
} else if ($c >= 'A' && $c <= 'Z') {
$s[$i] = $letters[(ord($c) - 39 + $n) % 26 + 26];
}
}
return $s;
}
?>
But using strtr() you can get something 10 times as fast as the above :
<?php
function str_rot($s, $n = 13) {
static $letters = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz';
$n = (int)$n % 26;
if (!$n) return $s;
if ($n < 0) $n += 26;
if ($n == 13) return str_rot13($s);
$rep = substr($letters, $n * 2) . substr($letters, 0, $n * 2);
return strtr($s, $letters, $rep);
}
?>
This technique is faster because PHP's strtr is implemented in C using a byte lookup table (it has O(m + n) complexity). However, PHP 6 will use Unicode, so I guess(?) strtr will then have to be implemented with a search for each character (O(m * n)). Using strtr might still be faster since it offloads the character manipulation to C rather than PHP, but I don't really know. Take your pick.
Happy coding!
(Benchmark code):
<?php
for ($k = 0; $k < 10; $k++) {
$s = 'The quick brown fox jumps over the lazy dog.';
$t = microtime(1);
for ($i = 0; $i < 1000; $i++) $s = str_rot($s, $i);
$t = microtime(1) - $t;
echo number_format($t, 3) . "\n";
}
?>
str_rot13
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
str_rot13 — Perform the rot13 transform on a string
Description
Performs the ROT13 encoding on the string argument and
returns the resulting string.
The ROT13 encoding simply shifts every letter by 13 places in the alphabet while leaving non-alpha characters untouched. Encoding and decoding are done by the same function, passing an encoded string as argument will return the original version.
Parameters
-
string -
The input string.
Return Values
Returns the ROT13 version of the given string.
Examples
Example #1 str_rot13() example
<?php
echo str_rot13('PHP 4.3.0'); // CUC 4.3.0
?>
add a note
User Contributed Notes 12 notes
shaun ¶
12 years ago
arthur at kuhrmeier dot com ¶
9 years ago
I was writing a function for my website to also rotate numbers, and kept expanding it. I added extra characters, the ability to define the shift in percent, and which type of characters to affect.
<?php
//================================================== STRING ROTATE EXPANDED
function str_shift ($string, $perc=50, $useextra=FALSE, $usedigits=TRUE, $useupper=TRUE, $uselower=TRUE) {
static $chars = array(
'lower' => 'abcdefghijklmnopqrstuvwxyz',
'upper' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
'digits' => '0123456789',
'extra' => ',.-()<>%/!"&=;:_[]{}#\\?\'+*',
);
settype($perc, 'float');
if (!$perc) return $string;
$perc = fmod((abs($perc) < 1 ? 100*$perc : $perc), 100);
if ($perc < 0) $perc += 100;
$use = (is_array($useextra) ? $useextra : array('lower'=>$uselower, 'upper'=>$useupper, 'digits'=>$usedigits, 'extra'=>$useextra));
foreach ($chars as $type => $letters) {
if (!$use[$type]) continue;
$shift = round(strlen($letters) * $perc / 100);
$repl = substr($letters, $shift).substr($letters, 0, $shift);
$string = strtr($string, $letters, $repl);
}
return $string;
}
//===== USAGE =====
string str_shift ( string $str [, float $percent [, bool $useextra [, bool $usedigits [, bool $uselower [, bool $useupper] ] ] ] ] )
string str_shift ( string $str [, float $percent [, array $usetypes ] ] )
$usetypes = array('lower'=>bool $uselower, 'upper'=>bool $useupper, 'digits'=>bool $usedigits, 'extra'=>bool $useextra);
//===== EXAMPLES =====
$string = "Peter's 17 pets (incl. 5 hamsters) love Dr Sarah Gibson, DVM!";
echo str_shift($string);
echo str_shift($string, 50, TRUE);
echo str_shift($string, -25, FALSE, FALSE);
echo str_shift($string, 1/3);
echo str_shift($string, 50, array('lower'=>TRUE, 'digits'=>TRUE));
?>
//===== RESULT =====
Crgre'f 62 crgf (vapy. 0 unzfgref) ybir Qe Fnenu Tvofba, QIZ!
Crgre"f 62 crgf [vapy: 0 unzfgref] ybir Qe Fnenu Tvofba; QIZ?
Jynyl'm 17 jynm (chwf. 5 bugmnylm) fipy Xl Mulub Acvmih, XPG!
Yncna'b 40 yncb (rwlu. 8 qjvbcnab) uxen Ma Bjajq Prkbxw, MEV!
Prgre'f 62 crgf (vapy. 0 unzfgref) ybir De Snenu Gvofba, DVM!
1. The basic parameters are the string and the percentage, 50 by default. The next four parameters allow to select which type of characters to process. There is a good reason why I put less common types first, and most obvious last. To activate extra characters you need only 1 additional parameter, otherwise you would need 4 enabling also the obvious types.
2. The definition for the letters and digits is obvious. For the extra characters I chose kind of pairs that make sense when shifted by 50%, e.g. () => [] or & => + etc. Of course you can adjust those characters to anything you like.
3. The first step is to clean the percentage, and also allow "real" floats, e.g. 1/3 for 33.33%.
4. The next step secures great flexibility when using the function. As described, instead of 4 boolean parameters you can pass 1 array. E.g. the array('upper' => TRUE) will enable the change of uppercase letters only.
5. Finally the function goes through every type and shifts the characters according to the given percentage.
I hope you can use this function and do some fancy stuff with it. Rotating characters doesn't really make sense, but it can be fun.
Arthur :-)
peter at NOSPAM jamit dot com ¶
15 years ago
This ROT13 variant is different from my earlier version in that it retains 'ethnicity'. For example, a Chinese text when encrypted will remain Chinese, and the string will not be making sense (the real meaning will be encrypted). Just look at the code and you will understand.
<?php
function unichar2ords($char, $encoding = 'UTF-8') {
$char = mb_convert_encoding($char, 'UCS-4', $encoding);
$val = unpack('N', $char);
return $val[1];
}
function ords2unichar($ords, $encoding = 'UTF-8'){
$char = pack('N', $ords);
return mb_convert_encoding($char, $encoding, 'UCS-4');
}
function mbStringToArray ($string, $encoding = 'UTF-8') {
if (empty($string)) return false;
for ($strlen = mb_strlen($string, $encoding); $strlen > 0; ) {
$array[] = mb_substr($string, 0, 1, $encoding);
$string = mb_substr($string, 1, $strlen, $encoding);
$strlen = $strlen - 1;
}
return $array;
}
function unicodeRotN($str, $offset, $encoding = 'UTF-8') {
$val = '';
$array = mbStringToArray ($str, $encoding = 'UTF-8');
$len = count($array);
for ($i = 0; $i < $len; $i++) {
$val .= ords2unichar(unichar2ords($array[$i], $encoding) + $offset, $encoding);
}
return $val;
}
// example
$original = '中國是我的家'; // means "China is my home"
$encrypted = unicodeRotN($string, 13); // 为團昼戞皑寃 means "Ñ Ai injustice for the Mission Day" (Google translation)
$decrypted = unicodeRotN($encrypted, -13); // 中國是我的家
?>
maximius at gmail dot com ¶
17 years ago
Perhaps someone will find this useful ;)
<?
function rotN($s, $n){
$s2 = "";
for($i = 0; $i < strlen($s); $i++){
$char2 = $char = ord($s{$i});
$cap = $char & 32;
$char &= ~ $cap;
$char = $char > 64 && $char < 123 ? (($char - 65 + $n) % 26 + 65) : $char;
$char |= $cap;
if($char < 65 && $char2 > 64 || ($char > 90 && $char < 97 && ($char2 < 91 || $char2 > 96))) $char += 26;
else if($char > 122 && $char2 < 123) $char -= 52;
if(strtoupper(chr($char2)) === chr($char2)) $char = strtoupper(chr($char)); else $char = strtolower(chr($char));
$s2 .= $char;
}
return $s2;
}
?>
It takes any string, $s, and any ROT value, $n. Just like str_rot13, it's both an encoder and decoder. To decode an encoded string, just pass -$n instead of $n.
Chris ¶
6 years ago
A nice, simple way of using rot-n. Allows for a lot of easy customisation, and works quickly. This function uses ASCII characters and values.
<?php
function rotn($val, $n) {
$min = 0;
$max = 127;
$final = '';
$new_string = str_split($val);
foreach ($new_string as $letter) {
$current = ord($letter);
$val = $current+$n;
if ($val >= $max) {
$val = $val - $max;
}
if ($val <= $min) {
$val = $val + $min;
}
$current = $val;
$final .= chr($current);
}
return $final;
}
echo 'Test 123 (4) -> '.rotn("Test 123", 4).'<br>'; // Xiwx$567
echo 'Test 123 (8) -> '.rotn("Test 123", 8).'<br>'; // \m{|(9:;
echo 'Test 123 (-4) -> '.rotn("Test 123", -4).'<br>'; // Paop -./
$value = rotn("Test 123", 8);
echo 'Test 123 (Reverse [8 then -8]) -> '.rotn($value, -8).'<br>'; // Test 123
?>
agente007_1_ at hotmail dot com ¶
9 years ago
/**
SALVAJE COMENTARIO EN ESPAÑOL XD
*/
<?php
$cadena = $_POST['entrada'];
/**convierte en cadena*/
$array = str_split($cadena);
echo $cadena ."<br>";
for ($i=0; $i < count($array); $i++) {
if( $array[$i] >= "A" && $array[$i] <= "M" ){
$letra = ord($array[$i]);
$letra = $letra + 13;
echo chr($letra);
}
if( $array[$i] >= "N" && $array[$i] <= "Z" ){
$letra = ord($array[$i]);
$letra = $letra - 13;
echo chr($letra);
}
}
?>
electro at whatever dot com ¶
17 years ago
<?php
/**
* Rotate each string characters by n positions in ASCII table
* To encode use positive n, to decode - negative.
* With n = 13 (ROT13), encode and decode n can be positive.
*
* @param string $string
* @param integer $n
* @return string
*/
function rotate($string, $n) {
$length = strlen($string);
$result = '';
for($i = 0; $i < $length; $i++) {
$ascii = ord($string{$i});
$rotated = $ascii;
if ($ascii > 64 && $ascii < 91) {
$rotated += $n;
$rotated > 90 && $rotated += -90 + 64;
$rotated < 65 && $rotated += -64 + 90;
} elseif ($ascii > 96 && $ascii < 123) {
$rotated += $n;
$rotated > 122 && $rotated += -122 + 96;
$rotated < 97 && $rotated += -96 + 122;
}
$result .= chr($rotated);
}
return $result;
}
$enc = rotate('string', 6);
echo "Encoded: $enc<br/>\n";
echo 'Decoded: ' . rotate($enc, -6);
?>
devcoder at gmail dot com ¶
6 years ago
My own generic rotN function
<?php
function rotN($string, $n = 13)
{
$alphabet = join(range('a', 'z'));
$alen = strlen($alphabet);
$n %= $alen;
if($n < 0) {
$n += $alen;
}
if($n == 0) {
return $string;
}
$cycled = substr($alphabet . $alphabet, $n, $alen);
$alphabet = $alphabet . strtoupper($alphabet);
$cycled = $cycled . strtoupper($cycled);
return strtr($string, $alphabet, $cycled);
}
?>
shaunspiller at spammenotgmail dot com ¶
15 years ago
Here's my implementation of a str_rot that takes a custom offset. It's faster than the others here because it allocates the output string in one go instead of tacking on characters one at a time. It can handle positive or negative offsets of any size, and it fixes everything up to ensure only upper and lower case letters are translated and that they wrap around correctly within the alphabet.
<?php
function str_rot($s, $n = 13) {
$n = (int)$n % 26;
if (!$n) return $s;
for ($i = 0, $l = strlen($s); $i < $l; $i++) {
$c = ord($s[$i]);
if ($c >= 97 && $c <= 122) {
$s[$i] = chr(($c - 71 + $n) % 26 + 97);
} else if ($c >= 65 && $c <= 90) {
$s[$i] = chr(($c - 39 + $n) % 26 + 65);
}
}
return $s;
}
?>
arwab at surrealwebs dot com ¶
17 years ago
here's my rot function, it works anyway
<?php
/**
* preforms the rotation algorithm on the passed in string
*/
function _rot( $str , $dist=13 ){
if( !is_numeric($dist) || $dist < 0){
$dist = 13;
}
$u_lower = 65; $u_upper = 90;
$l_lower = 97; $l_upper = 122;
$char_count = ($u_upper - $u_lower) +1;
while( $dist > $char_count ){
$dist -= $char_count;
}
$newstr = '';
for( $i=0; $i<strlen($str); ++$i){
$c = ord($str[$i]);
/*
* Check if the character is within the bounds of our function (a-zA-z)
* if not it gets tacked on to the string as is and we move on to the
* next one.
*/
if( $c<$u_lower || $c>$l_upper || ( $c>$u_upper && $c <$l_lower ) ){
$newstr .= chr($c);
continue;
}
$lower = ( $c<=$u_upper?$u_lower:$l_lower);
$upper = ( $c<=$u_upper?$u_upper:$l_upper);
$c += $dist;
if( $c > $upper){
$c = (($c - $upper) + ($lower-1));
}
$newstr .= chr($c);
}
return $newstr;
}
?>
steve ¶
11 years ago
Below is a short function that allows you to rotate a string which includes non alphabetic characters you choose.
By running the code without the second argument you can both obfuscate then de-obfuscate. This isn't a safe form of encryption, just a quick way to hide stuff from the casual viewer.
function str_rot($s, $n = -1) {
//Rotate a string by a number.
static $letters = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789.,!$*+-?@#'; //To be able to de-obfuscate your string the length of this needs to be a multiple of 4 AND no duplicate characters
$letterLen=round(strlen($letters)/2);
if($n==-1) $n=(int)($letterLen/2); //Find the "halfway rotate point"
$n = (int)$n % ($letterLen);
if (!$n) return $s;
if ($n < 0) $n += ($letterLen);
//if ($n == 13) return str_rot13($s);
$rep = substr($letters, $n * 2) . substr($letters, 0, $n * 2);
return strtr($s, $letters, $rep);
}
$input="ABC123";
$output=str_rot($input);
echo $input." = ".$output." = ".str_rot($output)."<br>";
peter at NOSPAM jamit dot com ¶
15 years ago
Here is my ROT13 function that works for all possible characters and not just ASCII. It can be used on Chinese, Japanese, ....
<?php
function rot13encrypt ($str) {
return str_rot13(base64_encode($str));
}
function rot13decrypt ($str) {
return base64_decode(str_rot13($str));
}
// example
$string = '中國是我的家';
$encrypted = rot13encrypt ($string); // produces 5Yvg5MlY5cvi5bvE55dR5n62
$decrypted = rot13decrypt ($encrypted); // produces 中國是我的家
?>
