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.+ o) `% L  Y; j; L  h4 |
安装
9 D8 e; z0 f7 _# \通过Composer来管理依赖关系，首先将minimum-stability设置为dev
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3 k0 ^) a* w0 O! x! [% D- `  P' K然后执行：% m6 n; \/ c$ ]9 k& ]! N
composer require sc0vu/web3.php dev-master, d( ~. ~; u6 \8 U% D7 w
或者你可以在composer.json中添加这行。! A  s2 U/ s& F0 o0 @4 _

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用法, R8 e3 Z# B+ O: N( T
实例( w( d  Z+ S, W' i

1. use Web3\Web3;
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2. $web3 = new Web3('http://localhost:8545');
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3. 接口调用
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4. use Web3\Web3;& d8 T$ a% Y& ?. y" f, I$ q
   
5. use Web3\Providers\HttpProvider;' x, f9 n! D& i% g3 V
   
6. use Web3\RequestManagers\HttpRequestManager;5 E0 }7 w+ G7 P/ M3 p9 x
   
7. $web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545')));! E, }' Z: ?' |/ I5 a* P- i
   
8. // timeout
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9. $web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545', 0.1)));

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) F0 J3 ?. e9 L" G使用回调函数调用rpc
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1. $web3->clientVersion(function ($err, $version) {8 ]# B) F" s! F
   
2.     if ($err !== null) {" N9 D% L, r0 M& a: E; S( `
   
3.         // do something( P5 T1 x8 u! V: H1 S/ V8 S5 U. F
   
4.         return;, h" t& l% J! R" ], F
   
5.     }8 o5 B' a5 ~3 r0 d' z2 q
   
6.     if (isset($client)) {; k& v  S0 L* {. J9 m6 R2 D( _" d; v% a
   
7.         echo 'Client version: ' . $version;
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8.     }
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9. });
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10. eth, S  k5 z& f: ~) t3 Y, p7 V
    
11. use Web3\Web3;) M# Q5 Q" c( H$ c. g
    
12. $web3 = new Web3('http://localhost:8545');
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13. $eth = $web3->eth;3 Y6 q# L1 X$ q& K# f. ]
    
14. 这样也行：
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15. use Web3\Eth;, P& R- N9 d# L7 l7 u$ P- d
    
16. $eth = new Eth('http://localhost:8545');5 T" l. c+ O/ C
    
17. net* V2 S) D. M, o% {2 G
    
18. use Web3\Web3;
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19. $web3 = new Web3('http://localhost:8545');
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20. $net = $web3->net;
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21. 或者
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22. use Web3\Net;
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23. $net = new Net('http://localhost:8545');; e' u& ^) m6 B& f1 _, O4 Q6 R% k
    
24. batch
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25. web31 H# i7 b9 G; A; s( S
    
26. $web3->batch(true);0 q3 ]$ T9 `  A# }  O5 X( Q
    
27. $web3->clientVersion();0 n0 v; q& p8 I
    
28. $web3->hash('0x1234');
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29. $web3->execute(function ($err, $data) {( ?* A: M; T2 d  {/ p, v& h
    
30.     if ($err !== null) {: x2 O# r2 X( \/ G( i; _
    
31.         // do something4 `' H# G" Y' n
    
32.         // it may throw exception or array of exception depends on error type
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33.         // connection error: throw exception
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34.         // json rpc error: array of exception3 J' n4 X- r# c$ n- a: r$ T% v
    
35.         return;/ }' p. G1 v9 b9 L6 g$ D1 s* [8 l
    
36.     }
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37.     // do something
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38. });. @* ?+ \, o* G! r
    
39. eth3 X% ~2 j7 k3 Y$ z, {( D$ f3 m
    
40. $eth->batch(true);
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41. $eth->protocolVersion();2 n, E5 I1 g+ t* F# k1 l# J
    
42. $eth->syncing();# X5 N7 l- {7 R: i) f4 g/ n
    
43. $eth->provider->execute(function ($err, $data) {& L2 d) \4 x" O6 N  S# o
    
44.     if ($err !== null) {! q5 X" U2 b  U& F
    
45.         // do something
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46.         return;+ `& i, m" C1 @. ]2 c: \
    
47.     }
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48.     // do something
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49. });
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50. net6 }! M% z0 o& t9 E1 `+ H+ Q+ `- p
    
51. $net->batch(true);; w; m, [5 {' V1 }; Y
    
52. $net->version();/ ?: K( X- h7 s
    
53. $net->listening();. B  s6 |2 e, F8 g
    
54. $net->provider->execute(function ($err, $data) {
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55.     if ($err !== null) {2 h; k5 Y5 d$ z+ z4 G+ t+ U4 @+ g
    
56.         // do something
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57.         return;8 U& ?( p9 O% t! o
    
58.     }
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59.     // do something9 w* r) E- K  m; m
    
60. });
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61. personal
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62. $personal->batch(true);
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63. $personal->listAccounts();% n% D' [; N* _; x
    
64. $personal->newAccount('123456');
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65. $personal->provider->execute(function ($err, $data) {
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66.     if ($err !== null) {" W  h* Z; x* n8 `; `
    
67.         // do something& u2 h9 n9 ^7 e( s
    
68.         return;3 B" E: h: U' }) _: R8 s' u
    
69.     }! Q) p  i. t1 n( @0 V4 |
    
70.     // do something
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71. });  P/ y) j+ ?/ S* {! a' }% J
    
72. 智能合约Contract4 u1 _% d, X. `0 U+ n2 z
    
73. use Web3\Contract;4 }7 K! K: R* p/ `- e
    
74. $contract = new Contract('http://localhost:8545', $abi);
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75. // deploy contract9 P7 S) ^1 v! G
    
76. $contract->bytecode($bytecode)->new($params, $callback);" y/ R& ]8 k7 S" ~3 ]( S9 y6 [) X+ W
    
77. // call contract function# `, B* E- P7 I. |0 X( k
    
78. $contract->at($contractAddress)->call($functionName, $params, $callback);
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79. // change function state
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80. $contract->at($contractAddress)->send($functionName, $params, $callback);" |/ k! u% Q2 F6 J; D" e
    
81. // estimate deploy contract gas
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82. $contract->bytecode($bytecode)->estimateGas($params, $callback);
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83. // estimate function gas
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84. $contract->at($contractAddress)->estimateGas($functionName, $params, $callback);
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85. // get constructor data; [( L9 B% ]$ s8 M# A, y0 i
    
86. $constructorData = $contract->bytecode($bytecode)->getData($params);
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87. // get function data
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88. $functionData = $contract->at($contractAddress)->getData($functionName, $params);
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89. 将值分配给外部域（从回调域到域外）  N. e* d$ u4 r
    
90. 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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91. $newAccount = '';- W: g+ H7 f6 M  O9 h. P7 G0 M& B1 S
    
92. $web3->personal->newAccount('123456', function ($err, $account) use (&$newAccount) {
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93.     if ($err !== null) {
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94.         echo 'Error: ' . $err->getMessage();2 V( }/ Y8 J" C) Q) X
    
95.         return;$ U7 z# B$ Q$ ?! ?
    
96.     }) {' w: B& z" o. r- T* Y
    
97.     $newAccount = $account;
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98.     echo 'New account: ' . $account . PHP_EOL;
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99. });

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8 F! T! ]9 n3 d0 n4 {" Y4 ~, v4 rphp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。