PHP程序员如何利用web3.php进行以太坊开发 - 区块链技术 - BitMere

web3.php是一个PHP接口，主要用于与以太坊区块链及其生态系统进行交互.
安装
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;
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$web3 = new Web3('http://localhost:8545');
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接口调用
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use Web3\Web3;. X: z. C6 f7 ]/ v# R
use Web3\Providers\HttpProvider;' r7 J( Y8 H% z e
use Web3\RequestManagers\HttpRequestManager;
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$web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545')));! [) a7 |* u& K7 G8 ^" o& i
// timeout; l7 K% H: |, [& V" |: U) v( ^1 y
$web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545', 0.1)));

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使用回调函数调用rpc

$web3->clientVersion(function ($err, $version) {
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if ($err !== null) {
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// do something
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return;" v6 J$ w6 o- l" j1 ?* `+ W
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if (isset($client)) {9 v" ~ i% B& S. f
echo 'Client version: ' . $version;
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use Web3\Web3;2 ^6 R" W' k& ]* G, ^& i
$web3 = new Web3('http://localhost:8545');1 i- W5 a' |) B, {/ v$ t, t" g
$eth = $web3->eth;
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这样也行：
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use Web3\Eth;
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$eth = new Eth('http://localhost:8545');; J4 y% X5 I0 D: F, J3 P
net
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use Web3\Web3;
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$web3 = new Web3('http://localhost:8545');
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$net = $web3->net;9 O+ z& S& Y* W3 A' n
或者# A3 e) ~) t8 H$ u3 e
use Web3\Net;
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$net = new Net('http://localhost:8545');( c+ J" J; Y$ J# H
batch. F; J# Y; c( B1 v7 m5 O1 O" P
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$web3->batch(true);
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$web3->clientVersion();2 ~; U8 o. G, I) N! c# h5 Q) B
$web3->hash('0x1234');
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$web3->execute(function ($err, $data) {8 y% Q8 z, U6 ]3 O2 G
if ($err !== null) {
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// do something
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// it may throw exception or array of exception depends on error type" x& ~# D4 S2 O* P7 N" C& ?
// connection error: throw exception
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// json rpc error: array of exception* @/ u8 |7 ?% s( V- ]( h
return;
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}
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// do something3 B( h& r% r# I3 C$ L1 j% F
});
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eth$ Z" a$ K: u5 V: z% X+ @6 h Z
$eth->batch(true);
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$eth->protocolVersion();
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$eth->syncing();
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$eth->provider->execute(function ($err, $data) {9 [; H7 B, m [4 ]" ^( ^; g1 d
if ($err !== null) {# u0 v: t. A F0 |4 e' N& I
// do something
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return;# X r1 D" O7 z+ p) c4 A3 M: n
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// do something
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});
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net
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$net->batch(true);
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$net->version();! b( b- i, d0 {# M3 t! x
$net->listening();/ B+ B% P8 |+ M! _
$net->provider->execute(function ($err, $data) {
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if ($err !== null) {( `7 c: |, o1 H1 ?( ~' ?
// do something
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return;
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// do something
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});
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personal* ^( S a& E& l0 Q
$personal->batch(true);
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$personal->listAccounts();
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$personal->newAccount('123456');
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$personal->provider->execute(function ($err, $data) {: I- x$ f+ Y/ B5 J5 a1 S
if ($err !== null) {. h. W% X# @+ c( ?: F" V; Z$ ]
// do something A7 ]% F, O6 i3 O" Y
return;- @+ _9 j: c* L1 ^6 {
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// do something
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});- ?9 F9 `! w8 A( Z* T
智能合约Contract
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use Web3\Contract;- @( \) B m0 k) S' t! m- M/ o
$contract = new Contract('http://localhost:8545', $abi);
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// deploy contract% A6 a) o. c% H [# @4 p
$contract->bytecode($bytecode)->new($params, $callback);
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// call contract function/ A" N1 ~/ }% ?1 g; n5 k! l
$contract->at($contractAddress)->call($functionName, $params, $callback);3 G7 `7 }) {3 t9 W$ w5 A8 W
// change function state ]! ~% J) D0 s. k/ n
$contract->at($contractAddress)->send($functionName, $params, $callback);
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// estimate deploy contract gas! E; @! P& G* P# E0 w+ f
$contract->bytecode($bytecode)->estimateGas($params, $callback);( x$ Z! G% W, j8 [$ B& Y% F
// estimate function gas
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$contract->at($contractAddress)->estimateGas($functionName, $params, $callback);
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// get constructor data4 o5 ` f& x1 _+ R, w. j) |9 v$ O
$constructorData = $contract->bytecode($bytecode)->getData($params);
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// get function data J R: c, f% d! m( E
$functionData = $contract->at($contractAddress)->getData($functionName, $params);
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将值分配给外部域（从回调域到域外）1 W9 P6 V! L. f* [
由于和JavaScript回调不同，如果需要将值赋值到域外，我们需要给回调赋值。
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$newAccount = '';4 n/ ]" R' l g) V: K w
$web3->personal->newAccount('123456', function ($err, $account) use (&$newAccount) {
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if ($err !== null) {( h5 q& b$ K7 N4 g
echo 'Error: ' . $err->getMessage();
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return;$ q% \5 g/ j" H& @( M1 ~! X
}
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$newAccount = $account;
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echo 'New account: ' . $account . PHP_EOL;( U1 m% ]) a; F. X/ x4 u2 Z/ C0 p
});

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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。