Encode data by calling the encode_base64() function.
encode_base64( $bytes, $eol );
$bytes - String to be encoded.
$eol - The line-ending sequence to use. It is optional and defaults to '\n'.
The returned encoded string is broken into lines of no more than 76 characters each and it will end with $eol unless it is empty.
use MIME::Base64;
$string = 'base64 encoded string';
$encoded = encode_base64($string);