= 65 and $k <= 90) { $k = (( (($k - 65) + 13) % 26 ) + 65); } elseif ($k >= 97 and $k <= 122) { $k = (( (($k - 97) + 13) % 26 ) + 97); } elseif ($k >= 48 and $k <= 57) { // $k = (( (($k - 48) + 13) % 26 ) + 48); $k = (( (($k - 48) + 5) % 10 ) + 48); } $rot13text_rotated = $rot13text_rotated . Chr($k); } $rot13text_rotated = stripslashes($rot13text_rotated); return $rot13text_rotated; } ?>


ROT13 Decoder / Encoder



Here is a link you can paste into a post:

And here is the same thing, but in an easier to cut-and-paste format.
So back in the earliest days (well, my earliest days) of the Internet, when the web was shapeless and void, there was Usenet. And Kaibo looked upon it and it was good. And there was a scrambling in the void, a chaos, and Rot13* was created. And usenetters used it to hide information that they chose not to know.

Like spoilers, and.. well and spoilers.

* All you have to do is take each letter, assume A=1, B=2,... add 13 to it. And if the resultant number is greater than 26, subtract 26 from it and convert it back to a letter. (This is also known as the modulo)