php如何使用JSON-RPC查找以太坊中的最新塊哈希hash值？

我用PHP中開發了一個以太坊塊資源管理器，併成功地與個人服務器Geth節點創建了JSON-RPC通訊。然而，當我試圖找出最後一個區塊時，我陷入了困境。我在https://ethereum.gitbooks.io/frontier-guide/content/rpc.html 中讀到了很不錯的內容，可是我沒有任何方法去查詢到以太坊節點的哪個是最後一個塊。一旦我獲得了塊哈希，我就能夠有接口檢索完整的信息塊，但我不知道如何找到最新的塊哈希。

API接口中eth_blockNumber應該返回最新的塊號，可是如何獲得哈希？

問題解答

user@Kumquat:~$ curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["latest", false],"id":1}' localhost:8545
{"jsonrpc":"2.0","id":1,"result":{"difficulty":"0x31962a3fc82b",
 "extraData":"0x4477617266506f6f6c",
 "gasLimit":"0x47c3d8",
 "gasUsed":"0x0",
 "hash":"0x78bfef68fccd4507f9f4804ba5c65eb2f928ea45b3383ade88aaa720f1209cba",
 "logsBloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
 "miner":"0x2a65aca4d5fc5b5c859090a6c34d164135398226",
 "nonce":"0xa5e8fb780cc2cd5e",
 "number":"0x1e655a",
 "parentHash":"0x8b535592eb3192017a527bbf8e3596da86b3abea51d6257898b2ced9d3a83826",
 "receiptRoot":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
 "sha3Uncles":"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
 "size":"0x20e",
 "stateRoot":"0xdc6ed0a382e50edfedb6bd296892690eb97eb3fc88fd55088d5ea753c48253dc",
 "timestamp":"0x579f4981",
 "totalDifficulty":"0x25cff06a0d96f4bee",
 "transactions":[],
 "transactionsRoot":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
 "uncles":[]}}

用latest也能夠用eth_blockNumber，來獲得最新塊。

你能夠參考這個以太坊JSON RPC API

若是想系統的學習php開發以太坊的話推薦一個很受歡迎的在線互動教程： php以太坊，主要是介紹使用php進行智能合約開發交互，進行帳號建立、交易、轉帳、代幣開發以及過濾器和事件等內容。