str_rot13() 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 both done by str_rot13(), passing an encoded string as argument will return the original version.
declaration of str_rot13
string str_rot13 ( string $str )
test str_rot13 online
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