[ENH] Sources for implementation #1
Description
This should be a PHP implementation of the following:
- https://encoding.spec.whatwg.org/
- https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder
- https://github.com/anonyco/FastestSmallestTextEncoderDecoder/blob/master/EncoderDecoderTogether.src.js
- https://github.com/web-platform-tests/wpt/tree/master/encoding-detection
- https://github.com/web-platform-tests/wpt/tree/master/encoding
- https://github.com/web-platform-tests/wpt/tree/master/mimesniff/mime-types