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php程序员如何利用web3.php进行以太坊开发

 5 years ago
source link: http://blog.hubwiz.com/2018/07/18/ethereum-php-web3/?amp%3Butm_medium=referral
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通过Composer来管理依赖关系，首先将 minimum-stability 设置为 dev 

"minimum-stability": "dev"

然后执行：

composer require sc0vu/web3.php dev-master

或者你可以在 composer.json 中添加这行。 

"sc0vu/web3.php": "dev-master"

用法

实例 

use Web3\Web3;

$web3 = new Web3('http://localhost:8545');

接口调用 

use Web3\Web3;
use Web3\Providers\HttpProvider;
use Web3\RequestManagers\HttpRequestManager;

$web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545')));

// timeout
$web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545', 0.1)));

使用回调函数调用rpc 

$web3->clientVersion(function ($err, $version) {
    if ($err !== null) {
        // do something
        return;
    }
    if (isset($client)) {
        echo 'Client version: ' . $version;
    }
});

eth 

use Web3\Web3;

$web3 = new Web3('http://localhost:8545');
$eth = $web3->eth;

这样也行：

use Web3\Eth;

$eth = new Eth('http://localhost:8545');

net 

use Web3\Web3;

$web3 = new Web3('http://localhost:8545');
$net = $web3->net;

或者

use Web3\Net;

$net = new Net('http://localhost:8545');

batch

web3

$web3->batch(true);
$web3->clientVersion();
$web3->hash('0x1234');
$web3->execute(function ($err, $data) {
    if ($err !== null) {
        // do something
        // it may throw exception or array of exception depends on error type
        // connection error: throw exception
        // json rpc error: array of exception
        return;
    }
    // do something
});

eth

$eth->batch(true);
$eth->protocolVersion();
$eth->syncing();

$eth->provider->execute(function ($err, $data) {
    if ($err !== null) {
        // do something
        return;
    }
    // do something
});

net

$net->batch(true);
$net->version();
$net->listening();

$net->provider->execute(function ($err, $data) {
    if ($err !== null) {
        // do something
        return;
    }
    // do something
});

personal

$personal->batch(true);
$personal->listAccounts();
$personal->newAccount('123456');

$personal->provider->execute(function ($err, $data) {
    if ($err !== null) {
        // do something
        return;
    }
    // do something
});

智能合约Contract 

use Web3\Contract;

$contract = new Contract('http://localhost:8545', $abi);

// deploy contract
$contract->bytecode($bytecode)->new($params, $callback);

// call contract function
$contract->at($contractAddress)->call($functionName, $params, $callback);

// change function state
$contract->at($contractAddress)->send($functionName, $params, $callback);

// estimate deploy contract gas
$contract->bytecode($bytecode)->estimateGas($params, $callback);

// estimate function gas
$contract->at($contractAddress)->estimateGas($functionName, $params, $callback);

// get constructor data
$constructorData = $contract->bytecode($bytecode)->getData($params);

// get function data
$functionData = $contract->at($contractAddress)->getData($functionName, $params);

将值分配给外部域（从回调域到域外） 

由于和JavaScript回调不同，如果需要将值赋值到域外，我们需要给回调赋值。

$newAccount = '';

$web3->personal->newAccount('123456', function ($err, $account) use (&$newAccount) {
    if ($err !== null) {
        echo 'Error: ' . $err->getMessage();
        return;
    }
    $newAccount = $account;
    echo 'New account: ' . $account . PHP_EOL;
});

为了解决php程序员学习以太坊的需求，我们提供很受欢迎的互动教程：php以太坊，主要是介绍使用php进行智能合约开发交互，进行账号创建、交易、转账、代币开发以及过滤器和事件等内容。

其他一些教程：

  • web3j教程，主要是针对java和android程序员进行区块链以太坊开发的web3j详解。
  • 以太坊教程，主要介绍智能合约与dapp应用开发，适合入门。
  • 以太坊开发，主要是介绍使用node.js、mongodb、区块链、ipfs实现去中心化电商DApp实战，适合进阶。
  • python以太坊，主要是针对python工程师使用web3.py进行区块链以太坊开发的详解。

汇智网原创翻译，转载请标明出处。这里是 原文


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