Base64 encoding

urlencode actually seems different.
"Returns a string in which all non-alphanumeric characters except -_. have been replaced with a percent (%) sign followed by two hex digits and spaces encoded as plus (+) signs."

I read this as urlencode is ignoring - and _. I need to modify these as per the code above.

The base64URLEncode function above replaces both of these. What to do?

I'd like to simulate this function in php. How?


  return str.toString('base64')
    .replace(/\+/g, '-')
    .replace(/\//g, '_')
    .replace(/=/g, '');
}

proof that an old dog can learn new tricks