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.1 Q& U8 |  r+ s3 s5 L9 Z/ ?: |* s
安装
& \: T! M6 Q; a, r# V0 y+ x! l通过Composer来管理依赖关系，首先将minimum-stability设置为dev
2 E4 @; W/ m% F7 P"minimum-stability": "dev"
# X1 T5 y. ?9 F8 X, z然后执行：  I  W$ s2 v! l5 K& k
composer require sc0vu/web3.php dev-master! t8 q) j; S- O8 i+ g1 C
或者你可以在composer.json中添加这行。; p2 g, b/ ?' s; D2 j

1 [# Y1 k) y6 a) F1 f3 s, O"sc0vu/web3.php": "dev-master"0 q% h9 x$ n# u2 z
用法
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1. use Web3\Web3;8 v% T' e0 k  a, c- @! V$ P% g
   
2. $web3 = new Web3('http://localhost:8545');2 v* [+ e1 R: [+ a
   
3. 接口调用( c4 h# Y5 V$ N
   
4. use Web3\Web3;' d1 M3 n5 Y9 Y/ Y
   
5. use Web3\Providers\HttpProvider;+ I" n9 \' C1 e9 f4 r- G
   
6. use Web3\RequestManagers\HttpRequestManager;) V9 t1 Q# V5 l- ], c
   
7. $web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545')));
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8. // timeout
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9. $web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545', 0.1)));

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- g9 v1 y' H. d使用回调函数调用rpc
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1. $web3->clientVersion(function ($err, $version) {
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2.     if ($err !== null) {
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3.         // do something. m; ^7 _( g" l
   
4.         return;
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5.     }
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6.     if (isset($client)) {
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7.         echo 'Client version: ' . $version;- Y& x3 r6 @0 V; p; }6 l. I
   
8.     }
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9. });, G8 |# R, w1 k
   
10. eth
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11. use Web3\Web3;$ X' C- e, o0 ~6 o, T& m
    
12. $web3 = new Web3('http://localhost:8545');
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13. $eth = $web3->eth;
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14. 这样也行：
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15. use Web3\Eth;% i- T/ c' {* `- w
    
16. $eth = new Eth('http://localhost:8545');' Y7 k2 @& \+ `3 O6 [/ R
    
17. net
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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;7 {( e* [8 n) _. E0 p* m. N, Q
    
23. $net = new Net('http://localhost:8545');3 Y3 O" p  q* k0 m/ e8 @+ g& o/ m
    
24. batch: `! N: W! }3 t& N
    
25. web3
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26. $web3->batch(true);
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27. $web3->clientVersion();# f* g/ C0 I2 ^- m. ~5 t
    
28. $web3->hash('0x1234');( k6 R$ w# o! Y2 k
    
29. $web3->execute(function ($err, $data) {! C! N6 H/ v& ^5 c% u# b) o
    
30.     if ($err !== null) {
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31.         // do something
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32.         // it may throw exception or array of exception depends on error type
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33.         // connection error: throw exception% i3 M" {, `; g1 ^2 N/ b8 Y7 P. Z
    
34.         // json rpc error: array of exception0 E3 }& n- U; U0 Q- j4 x: i5 y
    
35.         return;
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36.     }$ J# p( ]9 ^$ V4 i1 [4 G
    
37.     // do something
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38. });
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39. eth
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40. $eth->batch(true);5 X! x9 R7 C1 m" ?2 M
    
41. $eth->protocolVersion();6 t1 D4 ?5 b! @8 R6 n) u
    
42. $eth->syncing();( W/ R, U3 h7 f& T4 |" H
    
43. $eth->provider->execute(function ($err, $data) {
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44.     if ($err !== null) {6 p; F4 Z4 H3 |: M4 y
    
45.         // do something
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46.         return;
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47.     }% L/ ]+ m( K2 a$ ~' E' [
    
48.     // do something8 I( f9 T- D$ c9 W9 `  ^9 U
    
49. });
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50. net
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51. $net->batch(true);* ^- Z& D+ [# `4 j
    
52. $net->version();
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53. $net->listening();# \, h( R- m  X4 X. a
    
54. $net->provider->execute(function ($err, $data) {
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55.     if ($err !== null) {
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56.         // do something
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57.         return;' A$ W* U3 z. X( `8 ?
    
58.     }
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59.     // do something* k; e; u! K. w6 T
    
60. });
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61. personal
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62. $personal->batch(true);/ |8 Q/ c# H0 @2 V' f- @: \
    
63. $personal->listAccounts();
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64. $personal->newAccount('123456');; @; S0 o2 E0 T" l. [
    
65. $personal->provider->execute(function ($err, $data) {
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66.     if ($err !== null) {& a& t: r, n4 j9 b% Y
    
67.         // do something) z0 _* @; J; D# A* P
    
68.         return;* ]2 {; ~- k. K' n
    
69.     }2 v! i3 F# c/ G9 j/ S+ Z* U
    
70.     // do something
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71. });$ [/ y- `/ f6 q
    
72. 智能合约Contract' _" [! j: _# j& @1 m
    
73. use Web3\Contract;3 G  w( O. _" I% A5 V( t6 l6 y
    
74. $contract = new Contract('http://localhost:8545', $abi);0 r* ?) A; ?' W3 S/ i( @2 B) F
    
75. // deploy contract# r) D% d4 g/ ^, V$ }& V. q8 U
    
76. $contract->bytecode($bytecode)->new($params, $callback);) ]# [( H- U/ N3 p% L$ c  t7 `
    
77. // call contract function' g' @$ z5 p' \0 R$ ~
    
78. $contract->at($contractAddress)->call($functionName, $params, $callback);
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79. // change function state% _: i$ q5 N2 d: U1 l8 F; B, m
    
80. $contract->at($contractAddress)->send($functionName, $params, $callback);
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81. // estimate deploy contract gas
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82. $contract->bytecode($bytecode)->estimateGas($params, $callback);
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83. // estimate function gas  R$ ]* w. d: \6 {" M# z
    
84. $contract->at($contractAddress)->estimateGas($functionName, $params, $callback);
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85. // get constructor data# V, w5 P* U5 H# N
    
86. $constructorData = $contract->bytecode($bytecode)->getData($params);) t* s( s7 `% z" n. N* l1 {
    
87. // get function data
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88. $functionData = $contract->at($contractAddress)->getData($functionName, $params);5 r/ m/ r) B+ d0 q
    
89. 将值分配给外部域（从回调域到域外）
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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。5 L- `( F, z4 m8 E% d2 f% W. t2 c
    
91. $newAccount = '';- }6 B4 O' I; N; q& s: g9 `" A
    
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();8 j0 E; _1 G5 c% l, _& ~
    
95.         return;) H9 Z7 Z* ?" V5 t4 v1 \
    
96.     }7 x- E8 I% K) B+ ?% L' N& ]1 B! S& r
    
97.     $newAccount = $account;3 L' k. Q% x6 L
    
98.     echo 'New account: ' . $account . PHP_EOL;
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99. });

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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。