PHP performs ROT13 encoding function str_rot13() on strings

Example

Encoding and decoding String:

<?php
echo str_rot13("Hello World");
echo "<br>";
echo str_rot13("Uryyb Jbeyq");
?>

Definition and usage

str_rot13() FunctionCharacter The string performs ROT13 encoding.

ROT13 encoding is obtained by moving each letter forward 13 letters in the alphabet. Numeric and non-alphabetic characters remain unchanged.

Tip: Encoding and decoding are both done by the same function. If you pass an encoded string as a parameter, the original string will be returned.

Syntax

str_rot13(string)

Parameters	Description
string	Required. Specifies the string to be encoded.

Technical details

Return value:	Returns a ROT13 encoded string.
PHP Version:	4.2.0+
Change Log:	Prior to PHP 4.3, strings could be modified as if passed by reference.

Example

Encode and then decode the string:

<?php
echo str_rot13("I love Shanghai");
echo "<br>";
echo str_rot13("V ybir Funatunv");
?>

Result:

"; echo str_rot13("V ybir Funatunv"); ?>

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