How to use php to implement EOS offline signature transaction

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Keosd, the wallet server of the EOS blockchain, provides a sign_transaction development interface that allows developers to sign transactions. But if we want to manage the key ourselves instead of handing it over to keosd, how can we implement the offline signature of the transaction in the PHP code?

The answer is to use EosTool, the PHP package for EOS application development. EosTool's LocalSigner class makes it easy to sign EOS transactions offline. For example, the following code uses a private key that it manages to sign a token transfer transaction:

Use EosTool\ Signer\ LocalSigner $tx = ['expiration'= >' 2018-12-04T17VIED 00V, 'ref_block_num' = > 2878,' ref_block_prefix' = > 29012031, 'max_net_usage_words' = > 0,' max_cpu_usage_ms' = > 0, 'delay_sec' = > 0,' context_free_actions' = > [], 'actions' = > [' account' = > 'eosio.token',' name' = > 'transfer'' 'authorization' = > [[' actor' = > 'eosio',' permission' = > 'active']],' data' = > '11223344556677889900112233456677.889900']],' transaction_extensions' = > [] $pubKeys = [...]; $chainId = '...'; $signer = new LocalSigner (['5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3'] / * private keys*/); $signatures = $signer- > sign ($tx,$pubKeys,$chainId)

To instantiate LocalSigner, you need to pass in a set of private keys for signature, and then call its sign () method to pass in the transaction initiation account public key array and chunk chain ID. The returned result is the authoritative signature array of the transaction.

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