PHP implements content parsing for interaction with Ethereum through JSON-RPC

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Since last year, we are developing blockchain (Blockchain) business. Having recently used Ethereum and working with PHP, I thought we'd chat about this topic.

There is a premise here:

• 1. Understand the blockchain

• 2. Have an understanding of programming languages

Text:

1. Development environment

We will use Ubuntu 14.04 LTS. After installing the operating system, enter the predetermined commands.

$ sudo apt-get update
$ sudo apt-get upgrade

After that I set up SSH, iptables, ntp, etc.

Then comes Apache PHP. The PHP version will be 5.5.

$ sudo apt - get install php 5 libapache 2 - mod - php 5 php 5 - curl

2. Introduction to Ethereum

This time we will use the Ethereum node made in GO language, go-ethereumreferred to as geth.

First let's add a repository.

$ sudo apt-get install software-properties-common
$ sudo add-apt-repository -y ppa：ethereum / ethereum
$ sudo add-apt-repository -y ppa：ethereum / ethereum-dev

After that, just install it.

$ sudo apt-get update
$ sudo apt-get install ethereum

Start geth immediately after the installation is completed.
First, create a data directory and describe the settings for the first block (the genesis block).

$ mkdir~ / eth_private_net
$ vim~ / eth_private_net / my_genesis.json

{
“nonce”：“0x0000000000000042”，
“timestamp”：“0x0”，
“parentHash”：“0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000”，
“extraData”：“0x0”，
“gasLimit”：“0xffffffff”，
“难度”：“0x4000”，
“mixhash”：“0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000”，
“coinbase”：“0x3333333333333333333333333333333333333333”，
“alloc”：{}
}

Next, create the Genesis block and start geth.

$ geth --datadir "/home/yoshida/eth_private_net" init /home/yoshida/eth_private_net/my_genesis.json
$ geth --networkid 57598955 --port 8955 --nodiscover --datadir "/home/yoshida/eth_private_net" console 2>> /home/yoshida/eth_private_net/geth_err.log

When in console mode, the startup is successful.

Specifies several options, the explanations are summarized below.

• networkid, connect to public node.

• port, it is a port used for standby. I changed it to 4 digits.

• nodiscover, this is a setting that prevents nodes from automatically viewing.

• datadir, specifies the directory where the blockchain stores data.

• console, start the console at the same time.

Okay, let’s prepare for the next call to PHP, but before that let’s do a little more preparation on the geth side.

3. Prepare for JSON-RPC calls

Access from PHP via JSON-RPC. Here we will set up the neighborhood.

First, the current account information will be obtained. We also use the geth console we last started.

> eth.accounts
[]

We haven't created an account yet, so we need to create it.

> personal.newAccount("password")
"0xb83fa0d1c6b34a42f900cca5a32400c3b6f69f4b"
> eth.accounts
["0xb83fa0d1c6b34a42f900cca5a32400c3b6f69f4b"]

Account now created. We set it up so that we can get rewards when mining.

> miner.setEtherbase（eth.accounts [0]）

Next, since the current node does not allow RPC calls, add an option and start it again. First let's wrap up geth.

> exit

Let’s add options and restart

$ geth --networkid 57598955 --port 8955 --nodiscover --rpc --rpcaddr "0.0.0.0" --rpcport "8956" --rpccorsdomain "*" --rpcapi "eth,net,web3,personal" --datadir "/home/yoshida/eth_private_net" console 2>> /home/yoshida/eth_private_net/geth_err.log

Added several options for rpc. The explanation is as follows.

• rpc, allows RPC backup.

• rpcaddr, used for RPC backup IP address.

• rpcport, the port used to listen to RPC. I lowered the port number to 4 digits.

• rpccorsdomain, the domain that allows access to RPC. Note that when publishing a node, if it is "*" it will allow everything.

The node side is now ready. Next will be the call from PHP.

4. Access from PHP

The last thing is why access from PHP but have them because it is quite difficult to use this when you write code.

As you can see in the README, you only need to create a class.

Let's use it by placing it in the same directory as the test script.

$ cd /home/yoshida/php-eth/
$ ls -l
ethereum.php json-rpc.php
$ vim test.php
<?php require_once &#39;ethereum.php&#39;;
$ethereum = new Ethereum(&#39;localhost&#39;, &#39;8956&#39;);
print_r($ethereum->eth_accounts());

When we run this script, there should be a list of accounts as follows.

$ php test.php
Array
(
[0] => 0xb83fa0d1c6b34a42f900cca5a32400c3b6f69f4b
)

If you cannot connect, please check the port settings, etc.

So far, we have explained it simply, but does it feel like developing with PHP is surprisingly easy?

Related recommendations:

How the browser obtains relevant data through the JSON-RPC interface of the Bitcoin Core client

A simple json rpc framework example implemented in php

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