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;9 X$ ~7 \* C3 W* D2 D o; \/ S0 _
$web3 = new Web3('http://localhost:8545');
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接口调用/ i! V( N0 L) m0 Y6 ^
use Web3\Web3;
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use Web3\Providers\HttpProvider;
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use Web3\RequestManagers\HttpRequestManager;; e6 }3 e" K! ^- V* _# T' f. M4 M
$web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545')));
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// timeout
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$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, $version) {6 `+ v1 F: z t: j' }; j0 y/ q
if ($err !== null) {! l5 w! A* L% a5 u! A. O; G* Z$ `
// do something
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return;
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}! Y+ h" @ w, Y4 j( X+ N
if (isset($client)) {
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echo 'Client version: ' . $version;
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}1 ]- U }2 h1 i2 T8 d; t, C
});
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eth& u; C& y+ L+ O4 t8 U, r7 O2 h
use Web3\Web3;
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$web3 = new Web3('http://localhost:8545');# H/ ]; f5 z! g8 [) O4 x! Y' o
$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');
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net7 A% ?2 p/ x) M0 L' t
use Web3\Web3;; b; x& A4 `& v, P- A3 r
$web3 = new Web3('http://localhost:8545');
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$net = $web3->net;
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或者5 |. G% A3 v& [5 B/ s
use Web3\Net;
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$net = new Net('http://localhost:8545');2 f7 t3 C% @" m. A
batch
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web3
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$web3->batch(true);- I; {9 a0 B" A) y' `) N
$web3->clientVersion();$ w+ j' ~6 v; p \9 ~6 J9 X% X
$web3->hash('0x1234');
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$web3->execute(function ($err, $data) {
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if ($err !== null) {
// do something9 C8 c- b' Y& h% g. L6 F
// it may throw exception or array of exception depends on error type
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// connection error: throw exception$ A5 @6 `$ k; C
// json rpc error: array of exception0 F) _, Q& ?, p3 c2 `4 O c
return;
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// do something4 {1 H( }* k+ J
});7 B$ W+ B8 \! _7 w. A& ~
eth
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$eth->batch(true);- o1 g& m5 Z# R% R5 o6 v% @3 B, _
$eth->protocolVersion();
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$eth->syncing();
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$eth->provider->execute(function ($err, $data) {
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if ($err !== null) {% b7 f$ `1 c2 C/ f0 H4 N A5 T. t- e
// do something
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return;
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// do something; O5 a; O; k3 [4 P! Q! \
});8 X* G, O( c" u4 B+ K! e, q# d. n. F
net
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$net->batch(true);
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$net->version();
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$net->listening();
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$net->provider->execute(function ($err, $data) {1 j1 c/ Q& I" b9 D* C, f ~
if ($err !== null) {& k, n3 L- z: b7 \& g! z
// do something
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return;
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}
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// do something* \0 G$ v1 b) N: x8 r9 \- j
});7 \; e( A; u% j# r" ]
personal7 m2 ~* t) Q8 `# x$ I& b" ^. d0 s
$personal->batch(true);
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$personal->listAccounts();8 }5 n9 W8 x% H8 J5 z5 r
$personal->newAccount('123456');' i6 k: Z3 ]$ C9 r3 c6 }
$personal->provider->execute(function ($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 something5 m; [3 } u8 H# }2 E) ~
});* w2 ~; w. T" p% _ W3 k
智能合约Contract& Z$ d4 g' e/ I- i
use Web3\Contract;$ E# h* e- p/ i3 ]/ Z4 O
$contract = new Contract('http://localhost:8545', $abi); i! g8 \2 \- r: [& S2 V
// deploy contract
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$contract->bytecode($bytecode)->new($params, $callback);5 p* X- f! Z. O9 d/ c
// call contract function( A/ W$ X, y" d0 m% [
$contract->at($contractAddress)->call($functionName, $params, $callback);0 _1 @5 Q8 J0 U- n
// change function state
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$contract->at($contractAddress)->send($functionName, $params, $callback);
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// estimate deploy contract gas' A& H6 T) Z. X$ X: |1 n
$contract->bytecode($bytecode)->estimateGas($params, $callback);3 i7 b, T: J9 Q% C( Z+ Z" ]5 p
// estimate function gas
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$contract->at($contractAddress)->estimateGas($functionName, $params, $callback);5 s) v2 D8 L: S: {# f/ u& d
// get constructor data' b" E' K0 K0 g, G5 n
$constructorData = $contract->bytecode($bytecode)->getData($params);
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// get function data
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$functionData = $contract->at($contractAddress)->getData($functionName, $params);& d* e: ?* i0 q. I' D/ }
将值分配给外部域（从回调域到域外）+ O x+ h" x* _. z
由于和JavaScript回调不同，如果需要将值赋值到域外，我们需要给回调赋值。, t" M$ c8 P9 ~) V+ ]0 s7 i. K( l9 u
$newAccount = '';1 u! r( _' S' b* ^ }/ b( a
$web3->personal->newAccount('123456', function ($err, $account) use (&$newAccount) {
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if ($err !== null) {1 [; Y8 R5 f+ S* b$ S! S, L
echo 'Error: ' . $err->getMessage();
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return;$ i% O, u6 E$ |: n5 c- T
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$newAccount = $account;1 L: q7 a+ X" V8 g) w- ]1 t1 T
echo 'New account: ' . $account . PHP_EOL;
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});

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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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