RLP Encoding

There is simple RLP encoder M8B\EtherBinder\RLP\Encoder. As everywhere in library you can opt to get binary blob or hexadecimal representation with these 2 methods:

$hex = M8B\EtherBinder\RLP\Encoder::encodeHex(["data"]);
$bin = M8B\EtherBinder\RLP\Encoder::encodeBin(["data"]);

Encoding has a catch, that you might not expect - it does not wrap data into array. Most RLP encoders will wrap input into array, in example above, you will get "raw" encoding of "data" string, not ["data"]. This allows you to encode for example typed transactions with params [$transactionType, [$transactionData1, $transactionData2, ...]], such that first byte will be $transactionType, not array declaration.

RLP Decoding

Similar to encoding, there is decoding, which is consistent with encoding. You can use it with:

$data = M8B\EtherBinder\RLP\Decoder::decodeRLPBin($binaryBlob);
$data = M8B\EtherBinder\RLP\Decoder::decodeRLPHex($hexadecimal);

And again, if you pass RLP that's array from get-go, like LegacyTransaction, you will get nested array [[txData]], while if you pass Typed Transaction RLP you will get [transactionType, [txData]].