With simple PHP function you can encode any string in to base64. It accept any string characters.
Syntex
base64_encode(string $string): string
<?php $base64_encoded_string = base64_encode('ABCDECF");
// return value: QUJDREVDRg==
?>
Deccode base64 String
<?php
$base64_encode_string = "QUJDREVDRg==";
base64_decode($base64_encode_string);
// return value: ABCDECF
?>