web3.php

A php interface for interacting with the Ethereum blockchain and ecosystem. Assign a value to outside scope(from callback scope to outside scope) Due to the callback is not like a javascript callback, if we need to assign value to outside scope, we need to assign a reference to the callback. If you are using docker as a development machine, you can try ethdock to run local Ethereum blockchain, just simply run docker-compose up -d testrpc and expose the 8545 port.