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.
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通过Composer来管理依赖关系，首先将minimum-stability设置为dev. j* C. x, I( t5 _
"minimum-stability": "dev"
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composer require sc0vu/web3.php dev-master  E, C) o% z1 f" w2 [
或者你可以在composer.json中添加这行。8 i* A+ Q; ^  @  i% A" |

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用法
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1. use Web3\Web3;0 }' I$ ?9 H6 b0 M' a; f9 p% e: Z% W
   
2. $web3 = new Web3('http://localhost:8545');& D6 ]7 f$ [5 p
   
3. 接口调用1 m8 E: O9 S# d$ u* l
   
4. use Web3\Web3;
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5. use Web3\Providers\HttpProvider;
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6. use Web3\RequestManagers\HttpRequestManager;
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7. $web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545')));
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8. // timeout' K: y4 S8 n- W6 k
   
9. $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
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1. $web3->clientVersion(function ($err, $version) {6 O0 a" l/ K6 A) p! c- [
   
2.     if ($err !== null) {9 w: ^( g1 S5 |4 Q% n' h/ D
   
3.         // do something; M. ]3 F7 W& t3 Z$ i  B$ U
   
4.         return;2 [6 ~; D( L- o+ O; X2 \: V
   
5.     }) |9 p5 O9 C6 q6 x" [. n' T* \
   
6.     if (isset($client)) {4 s2 y$ o) ?$ |. ], P
   
7.         echo 'Client version: ' . $version;
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8.     }2 g" ]; j! p* K2 O9 u8 f
   
9. });$ n" f/ j  H! \5 |! X: z3 O
   
10. eth; @2 P9 d) P4 P6 y
    
11. use Web3\Web3;
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12. $web3 = new Web3('http://localhost:8545');/ ]4 j. M! i- T9 B
    
13. $eth = $web3->eth;
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14. 这样也行：
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15. use Web3\Eth;) A2 Q$ o6 X: X& A$ o( U
    
16. $eth = new Eth('http://localhost:8545');
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17. net+ ]) X! ^4 O( D6 c' b, G( R
    
18. use Web3\Web3;7 _7 y% I" _/ h' U; u% S
    
19. $web3 = new Web3('http://localhost:8545');
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20. $net = $web3->net;* ~3 f) \8 S# n
    
21. 或者
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22. use Web3\Net;/ |0 Z; {" p/ {; c
    
23. $net = new Net('http://localhost:8545');
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24. batch
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25. web3
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26. $web3->batch(true);5 V* L% f7 ?9 ?" n+ f
    
27. $web3->clientVersion();
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28. $web3->hash('0x1234');
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29. $web3->execute(function ($err, $data) {
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30.     if ($err !== null) {; s. y; ^+ h& S2 _% K8 q1 B
    
31.         // do something  k+ m4 I/ o) A0 S: X) K
    
32.         // it may throw exception or array of exception depends on error type; v- R8 q6 x5 C: E* l4 y$ K# G; Q
    
33.         // connection error: throw exception
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34.         // json rpc error: array of exception% h& R+ m) k" x
    
35.         return;
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36.     }- A9 |1 x& g. A; x' j  X
    
37.     // do something
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38. });: \% l; h( `- L' a. }# ?4 k
    
39. eth+ T# K( d8 K! ~  i. N
    
40. $eth->batch(true);
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41. $eth->protocolVersion();( u8 k7 T4 {( m$ }* g# o
    
42. $eth->syncing();
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43. $eth->provider->execute(function ($err, $data) {% \" E1 s9 \" j: t
    
44.     if ($err !== null) {0 Q8 K& ~6 N: M- p
    
45.         // do something: J$ P8 M0 @6 P/ c$ {; _$ Y8 \* }
    
46.         return;
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47.     }8 [* h' Q- {) P' }. \
    
48.     // do something" O% h! p; K" L) @
    
49. });
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50. net6 }7 p" i8 ~9 w4 |+ d. L* O2 `6 J
    
51. $net->batch(true);
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52. $net->version();, q( m9 t  _" z" F8 ?$ p8 q
    
53. $net->listening();
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54. $net->provider->execute(function ($err, $data) {
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55.     if ($err !== null) {3 l* |$ Q/ `% f3 d
    
56.         // do something
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57.         return;
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58.     }" r) l3 \$ J' @9 z( E
    
59.     // do something
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60. });6 Q- z; j0 [  {0 R8 X8 A
    
61. personal9 ]& p7 {, G% G: H6 p
    
62. $personal->batch(true);$ y. p' y, k- t1 d7 u
    
63. $personal->listAccounts();3 A7 c( A2 o( w; W4 g- s; m# O
    
64. $personal->newAccount('123456');* ?; Q/ }9 N% {% i* [
    
65. $personal->provider->execute(function ($err, $data) {
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66.     if ($err !== null) {* s) r3 G4 |) z& d! S
    
67.         // do something
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68.         return;
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69.     }
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70.     // do something
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71. });% `: V& W3 r* r8 v
    
72. 智能合约Contract
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73. use Web3\Contract;! X: U( x" I" A& m
    
74. $contract = new Contract('http://localhost:8545', $abi);
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75. // deploy contract
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76. $contract->bytecode($bytecode)->new($params, $callback);
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77. // call contract function
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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);
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81. // estimate deploy contract gas
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82. $contract->bytecode($bytecode)->estimateGas($params, $callback);, @6 G! y1 W1 ~5 _1 |6 U
    
83. // estimate function gas
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84. $contract->at($contractAddress)->estimateGas($functionName, $params, $callback);# ^2 \( e) A  H4 f5 z% m+ K2 }
    
85. // get constructor data+ ^  I* L3 }" ]: |2 y" ?
    
86. $constructorData = $contract->bytecode($bytecode)->getData($params);( o, w" B9 p. g" Y
    
87. // get function data
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88. $functionData = $contract->at($contractAddress)->getData($functionName, $params);
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89. 将值分配给外部域（从回调域到域外）& M- I8 u# V/ M7 d2 w$ N
    
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 = '';# u6 [) s3 F" c; `) q/ `- D6 ~& s# M
    
92. $web3->personal->newAccount('123456', function ($err, $account) use (&$newAccount) {( _3 z' I+ e2 y
    
93.     if ($err !== null) {7 m3 _' v) @$ |( Y5 l( [
    
94.         echo 'Error: ' . $err->getMessage();
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95.         return;2 V+ m; J1 u( [9 l6 y. J
    
96.     }
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97.     $newAccount = $account;
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98.     echo 'New account: ' . $account . PHP_EOL;
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99. });

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3 {. P* }5 E, ~  H% d$ Aphp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。