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# str_rot13

(PHP 4 >= 4.2.0, PHP 5)

str_rot13 -- Perform the rot13 transform on a string

## Description

string str_rot13 ( string str )

This function performs the ROT13 encoding on the str 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.

範例 1. str_rot13() example

`<?php echo str_rot13('PHP 4.3.0'); // CUC 4.3.0 ?>`

> 注: The behaviour of this function was buggy until PHP 4.3.0. Before this, the str was also modified, as if passed by reference.

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