PHP Version License Version

A high-performance PHP extension for RLP (Recursive Length Prefix) encoding and decoding, compatible with Ethereum’s transaction and contract formats. Built natively in C for maximum speed, fully interoperable with KornRunner’s RLP implementation and EVM tooling.

This extension matches Ethereum’s canonical RLP format used for:

• Transactions (nonce, gasPrice, to, value, data, v, r, s)
• Smart contract deployments and calls
• EIP-155 chain-ID encoding
• Event logs and receipts

The encoder supports:

• Raw binary and text strings
• Hex strings prefixed with 0x (converted to binary before encoding)
• Integers (int, long)
• Arrays (any nested structure)

The decoder returns:

• PHP string for raw values
• PHP array for RLP lists

sudo apt install php-dev autoconf make gcc

git clone https://github.com/RandomCoderTinker/php-rlp.git
cd php-rlp
phpize
./configure
make
sudo make install

Enable in php.ini:

extension=php_rlp.so

Restart PHP-FPM or your web server.

<?php
// RLP encode/decode strings
echo bin2hex(rlp_encode("Dog")); // 83446f67
echo rlp_decode(hex2bin("83446f67")); // Dog
// RLP encode an Ethereum transaction
$tx = [
 'nonce' => '0x00',
 'gasPrice' => '0x09184e72a000',
 'gasLimit' => '0x2710',
 'to' => '0x0000000000000000000000000000000000000000',
 'value' => '0x00',
 'data' => '',
 'v' => '0x1b',
 'r' => '0x00',
 's' => '0x00'
];
$encoded = rlp_encode($tx);
echo bin2hex($encoded);
// Decode
$decoded = rlp_decode($encoded);
print_r($decoded);

Benchmarked over 10,000 iterations on identical hardware.

This extension is ideal for:

• Ethereum & L2 Transaction Builders
• EVM-compatible VM integration
• Smart contract encode/decode
• Custom chains and wallets
• High-performance RPC & Bridge Layers

MIT © RandomCoderTinker

Built with ❤️ using PHP 8.1+