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.! X5 ?+ \& }9 V: K
安装
3 ~& f- ^! ?8 m- M+ d" I通过Composer来管理依赖关系，首先将minimum-stability设置为dev+ B' j$ I& ?4 ]! \
"minimum-stability": "dev"2 z( f1 }  l. V
然后执行：
& d; x5 @  \' f* S3 Dcomposer require sc0vu/web3.php dev-master
5 J" t6 R3 n3 x% L2 k或者你可以在composer.json中添加这行。5 P; y' j' J1 F

' N. @& R* B4 t# P: A8 C/ q"sc0vu/web3.php": "dev-master"
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实例
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1. use Web3\Web3;5 y5 `! ~& M2 E
   
2. $web3 = new Web3('http://localhost:8545');8 {' C( i1 _" l6 G" X
   
3. 接口调用5 L, L: A6 f; W
   
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')));4 g6 W! I& j# T# s# c: k) `% o- D
   
8. // timeout0 T, R, z* {; X5 ~# B0 F
   
9. $web3 = new Web3(new HttpProvider(new HttpRequestManager('http://localhost:8545', 0.1)));

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6 L/ ~+ I5 ?8 ~% j3 f" c使用回调函数调用rpc9 s5 ^. u  Y0 V% r* v5 Y) X

1. $web3->clientVersion(function ($err, $version) {
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2.     if ($err !== null) {
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3.         // do something
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4.         return;8 F, w6 T9 p; Q  N2 G  V
   
5.     }
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6.     if (isset($client)) {
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7.         echo 'Client version: ' . $version;8 }+ y- a( d& w
   
8.     }
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9. });
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10. eth
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11. use Web3\Web3;$ ~/ t3 b2 U9 z% w4 d+ ^
    
12. $web3 = new Web3('http://localhost:8545');3 R; m% p$ R+ @" \% s3 Q- e
    
13. $eth = $web3->eth;( p8 ]  l6 D  Q$ H/ P( W) P
    
14. 这样也行：
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15. use Web3\Eth;. ~! A6 S, p: {9 ?' c, z! T6 i
    
16. $eth = new Eth('http://localhost:8545');. I. B7 g6 F9 {( l+ Z% ]7 T, g* _" ]6 x+ q
    
17. net
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18. use Web3\Web3;# x2 ^2 w9 G5 j6 T5 l1 K. @' C2 P
    
19. $web3 = new Web3('http://localhost:8545');  P! E. L) B  }- `5 n2 ?: D+ ~/ ~) Y
    
20. $net = $web3->net;; j5 @! h: O3 G" A
    
21. 或者
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22. use Web3\Net;
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23. $net = new Net('http://localhost:8545');/ u# u5 ?+ X5 R# @
    
24. batch
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25. web3" E" K3 n7 c3 V+ i9 ?" _% }
    
26. $web3->batch(true);
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27. $web3->clientVersion();; ?' {0 g( H/ E' n9 D8 ^
    
28. $web3->hash('0x1234');
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29. $web3->execute(function ($err, $data) {
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30.     if ($err !== null) {
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31.         // do something+ M7 S' P$ |/ m" ~2 `# L1 M# S% O0 v
    
32.         // it may throw exception or array of exception depends on error type
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33.         // connection error: throw exception9 T5 {  u$ I9 ]" |2 F* s
    
34.         // json rpc error: array of exception' p. b. j: G' X! f! d
    
35.         return;( a/ p( \9 u; R; I1 |& L
    
36.     }( ]7 n, U3 |! {' Y) }
    
37.     // do something
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38. });
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39. eth
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40. $eth->batch(true);4 l1 Q0 a) q2 a. L
    
41. $eth->protocolVersion();' @# i4 K+ I* x$ D4 l
    
42. $eth->syncing();
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43. $eth->provider->execute(function ($err, $data) {
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44.     if ($err !== null) {
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45.         // do something
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46.         return;
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47.     }) G( k' y' q+ ~
    
48.     // do something
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49. });" k, L( a; D9 \" [, m
    
50. net
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51. $net->batch(true);
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52. $net->version();
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53. $net->listening();( f7 b+ B$ d, Y. Y# V' R5 s' D3 v
    
54. $net->provider->execute(function ($err, $data) {$ k4 H7 Y9 j; |( Y5 x) e! T9 x
    
55.     if ($err !== null) {9 h* G. B) G% [8 f
    
56.         // do something3 S! v  N3 M+ L7 ~6 f
    
57.         return;
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58.     }% G/ P) W5 N: j2 F( r4 q
    
59.     // do something
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60. });
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61. personal( z7 c+ F. ~  B* Y9 T" M! m' s
    
62. $personal->batch(true);" l4 {5 B# C6 S, L9 z2 A! m
    
63. $personal->listAccounts();
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64. $personal->newAccount('123456');7 [& k: c, y8 b% E  X* w2 K4 ~
    
65. $personal->provider->execute(function ($err, $data) {
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66.     if ($err !== null) {
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67.         // do something
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68.         return;% c# |- M  j# z+ W1 R6 |* ]
    
69.     }& {# ]. W. V+ z  n9 B$ n
    
70.     // do something
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71. });
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72. 智能合约Contract- i$ s* H7 A7 s- ~  x% V) n' v- W* I0 e
    
73. use Web3\Contract;
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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: g& w1 ^8 T9 H& P: c: U, O
    
78. $contract->at($contractAddress)->call($functionName, $params, $callback);
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79. // change function state0 t+ |& _9 j0 |  z/ ?: 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, $callback);
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83. // estimate function gas2 d: n5 V$ Z0 P1 n2 B; N8 L4 h
    
84. $contract->at($contractAddress)->estimateGas($functionName, $params, $callback);  @, A# V  G4 z% _0 A/ g! F+ c
    
85. // get constructor data; d$ p' p/ M2 f/ F, _% o
    
86. $constructorData = $contract->bytecode($bytecode)->getData($params);* R- i! C4 o: p1 G
    
87. // get function data) u& M1 l2 z- i/ e0 o4 J! z8 T
    
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）1 Q' B3 i, w" ^2 g
    
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。# e3 n$ @! u! S
    
91. $newAccount = '';
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92. $web3->personal->newAccount('123456', function ($err, $account) use (&$newAccount) {8 o# y; c2 ~2 K# c7 N* w6 |
    
93.     if ($err !== null) {7 _0 ]# f) `8 J8 h9 n
    
94.         echo 'Error: ' . $err->getMessage();
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95.         return;
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96.     }
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97.     $newAccount = $account;
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98.     echo 'New account: ' . $account . PHP_EOL;0 U3 z& A0 P& p
    
99. });

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! i: J4 ~/ |& D, Gphp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。