About str_rot13 encryption
string str_rot13 ( string $str )
Performs the ROT13 encoding on the str argument and returns the resulting string.
str_rot13 encryption simply shifts every alphabet by 13 places, and does not make any change to non-alpha 
characters. The encode and decode in this encryption is done by the same function. If the encoded string is passed through the same function, it will give you the output in original version.
Parameters
str (This is 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 ?>
Changelog
Version Description 4.3.0 The behaviour of this function was fixed. Before this fix, the str was also modified, as if it was passed by reference.
Now we know how str_rot13 encryption works, lets explore mostly what it is used for:
Mostly it is use to protect complete/partial php code so it cannot be edited. Widely it is used in Most of the wordpress themes(Mostly in the footer). since i also encountered this problem. so i created a way to decode this shit of str_rot13.
here is the decoder for this encrytion, STR_ROT13 DECODER
ENJOY!!!
