PHP程序员如何利用web3.php进行以太坊开发

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;7 ?( j3 |# ^5 Z$ a4 _
$web3 = new Web3('http://localhost:8545');3 s6 u1 g# L3 p3 o2 S1 P
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use Web3\Web3;
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use Web3\Providers\HttpProvider;
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use Web3\RequestManagers\HttpRequestManager;
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$web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545')));
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// timeout
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$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, $version) {4 |3 |" \' y6 x0 B9 |2 r! W
if ($err !== null) {
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// do something+ W( \2 m7 a% n: [' _8 q0 F, I
return;( [/ h4 ]! W9 Y; z" M. b! ~
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if (isset($client)) {
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echo 'Client version: ' . $version;
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}
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});( @* B; @/ Q# H) G, O
eth
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use Web3\Web3;
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$web3 = new Web3('http://localhost:8545');
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$eth = $web3->eth;
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这样也行：
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use Web3\Eth;4 I2 _& p, ?/ Z) ]
$eth = new Eth('http://localhost:8545');
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net
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use Web3\Web3;- n: |2 M Q. U6 O) _) Z6 a
$web3 = new Web3('http://localhost:8545');
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$net = $web3->net;+ L9 I' a* v, x/ I2 |& \2 t
或者
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use Web3\Net;
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$net = new Net('http://localhost:8545');- y+ Q+ Y3 K, r: Y4 A; w
batch
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$web3->batch(true);
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$web3->clientVersion();1 s0 s" N* F: H2 y6 m
$web3->hash('0x1234');! {# y3 a' A# u; X! E
$web3->execute(function ($err, $data) {. j6 P9 `# B, O- Z6 `
if ($err !== null) {; S- V3 ?4 C, ~1 A4 m) H6 v, g6 g
// do something
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// it may throw exception or array of exception depends on error type; M3 B& N1 t' O: `4 y
// connection error: throw exception
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// json rpc error: array of exception
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return;
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}; v d6 @% s1 P$ j0 V6 F. X
// do something9 s% Q) s6 n( e! u
});
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eth/ ^4 B6 p# I8 ^# ^, p1 \
$eth->batch(true);! N6 f3 f' b4 g r5 H& v \
$eth->protocolVersion();% [- ^5 V* m' |
$eth->syncing();
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$eth->provider->execute(function ($err, $data) {
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if ($err !== null) {
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// do something
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return;& D1 V0 e& [# T/ f
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// do something
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});& |2 t9 g/ `( |6 [
net! T) E K. g/ U2 e) M5 ]. k V
$net->batch(true);3 f/ J! x* ? P1 X
$net->version();( i2 i, G5 N: Q( f" m% K/ j
$net->listening();
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$net->provider->execute(function ($err, $data) {
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if ($err !== null) {
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// do something
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return;
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// do something! l! F1 b" B. {: j( s" S$ N+ U
});
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personal
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$personal->batch(true);; C# V6 b% A9 K# b& T) f; O
$personal->listAccounts();; L8 A, g9 ^7 Z$ i2 t! }
$personal->newAccount('123456');/ F* h* k% ^" W4 o. a+ q+ a
$personal->provider->execute(function ($err, $data) {
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if ($err !== null) {
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// do something
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return;& W4 O7 I u* o4 B& b4 g3 e9 p: G
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// do something
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});
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智能合约Contract
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use Web3\Contract;
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$contract = new Contract('http://localhost:8545', $abi);
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// deploy contract0 Y5 ]" V# e: y
$contract->bytecode($bytecode)->new($params, $callback);: v4 Q2 F) |3 I5 f% K+ t
// call contract function) r8 u# k, {, N( f" I
$contract->at($contractAddress)->call($functionName, $params, $callback);
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// change function state
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$contract->at($contractAddress)->send($functionName, $params, $callback);
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// estimate deploy contract gas+ Q* N( w+ {0 B9 ?5 f; l
$contract->bytecode($bytecode)->estimateGas($params, $callback);& x, |9 T! o2 C! e. V
// estimate function gas' b. E5 V. C) Z9 R9 J* f
$contract->at($contractAddress)->estimateGas($functionName, $params, $callback);
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// get constructor data8 _) W! v6 X! W! O8 e
$constructorData = $contract->bytecode($bytecode)->getData($params);: ^* n) V' Y: ^, h" N- E
// get function data
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$functionData = $contract->at($contractAddress)->getData($functionName, $params);
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将值分配给外部域（从回调域到域外）# }& G5 t4 V( z- ?
由于和JavaScript回调不同，如果需要将值赋值到域外，我们需要给回调赋值。
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$newAccount = '';
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$web3->personal->newAccount('123456', function ($err, $account) use (&$newAccount) {
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if ($err !== null) {
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echo 'Error: ' . $err->getMessage();
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return;
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}
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$newAccount = $account;, i! X, a8 h2 K- z6 |7 }' ~
echo 'New account: ' . $account . PHP_EOL;# \/ P: N% n/ N5 A) u8 O* {
});

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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。

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