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Php how to use JSON-RPC to find the latest block hash value in Ethernet Square, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can get something.

I developed an ethernet block resource manager in PHP and successfully established JSON-RPC communication with my server Geth node. However, when I tried to find the last block, I got into trouble. I read something good in https://ethereum.gitbooks.io/frontier-guide/content/rpc.html, but I don't have any way to find out which block of the etheric place node is the last. Once I get the block hash, I can have the interface to retrieve the complete block of information, but I don't know how to find the latest block hash.

The eth_blockNumber in the API interface should return the latest block number, but how do I get the hash?

Question and answer user@Kumquat:~$ curl-X POST-- data'{"jsonrpc": "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": []}

With latest, you can also use eth_blockNumber to get the latest blocks.

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