Strings: add base64UrlEncode() and base64UrlDecode() #287
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…turn objects Type (BC break)
Since PHP 8.0 ReflectionParameter::getDefaultValue() correctly returns value or throws exception when constant cannot be resolved
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Base64 encoding is well known. It uses alphabet of 64 chars
A-Z a-z 0-9 + /and padding char=. While theA-Z a-z 0-9chars are URL safe, the remaining+ / =are not. So there is a "Base 64 Encoding with URL and Filename Safe Alphabet" as mentioned in RFC4648. This encoding replaces+by-and/by_and drops=padding.The base64Url encoding is for example used by JSON Web Tokens (JWT), which are used for example in Open ID Connect protocol.
The implementation is based on Appendix C of IETF draft.