🥔 terpomoj/base64-url-helpers

This package provides two global functions: base64_url_encode and base64_url_decode. I found myself using these helpers in a lot of my projects.

What is Base64 URL?

In RFC 3548, Base64 URL is a variant of Base64 that uses the URL-safe alphabet. Which replaces the + and / characters in standard base64 with - and _. Padding character (=) can be optionally removed or retained.

Usage

Install with composer:

$ composer require terpomoj/base64-url-helpers

Encode

To encode:

$encoded = base64_url_encode('🏳️‍⚧️🏳️‍🌈');

// $encoded is now '8J-Ps--4j-KAjeKap--4j_Cfj7PvuI_igI3wn4yI'

There is also a second optional parameter to base64_url_encode that allow you to specify weather you want to remove padding characters or not. Which is default to true, that will remove padding characters.

$encode = base64_url_encode('🏳️‍⚧️');
// $encode = '8J-Ps--4j-KAjeKap004jw'

$encode = base64_url_encode('🏳️‍⚧️', removePadding: false);
// $encode = '8J-Ps--4j-KAjeKap004jw=='

Decode

To decode:

$decoded = base64_url_decode('8J-Ps--4j-KAjeKap--4j_Cfj7PvuI_igI3wn4yI');

// $decoded is now '🏳️‍⚧️🏳️‍🌈'

Just like PHP's native base64_decode, by default, it allows you to pass a string that is not a valid base64 string.

$decoded = base64_url_decode('8J-Ps--4j-KAjeKap--4j_Cfj7PvuI_igI3wn4yI!!!!!');
// $decoded is now '🏳️‍⚧️🏳️‍🌈'

$decoded = base64_url_decode('8J-Ps--4j-KAjeKap--4j_Cfj7PvuI_igI3wn4yI!!!!!', strict: true);
// $decodes is now false

Why?

The main reason I use URL-safe base64 is to encode binary UUID, so that the UUID in URL can be shorter than HEX-encoded UUID:

$uuid = base64_url_encode(Uuid::uuid4()->getBytes());
// $uuid is now 'oRZS8dRtR-GfBdCbaHwtkw'

License

Licensed under MIT. See LICENSE file more details.