1. Go to this page and download the library: Download amashukov/abi-encoder-php library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
amashukov / abi-encoder-php example snippets
use Amashukov\AbiEncoder\AbiEncoder;
AbiEncoder::methodId('withdraw(address,uint256)'); // 'f3fef3a3'