how to derive child private key like electrum by php?

In Electrum console, we can run getprivatekeyforpath('0/0') to get the first child private key. How to implement this in php? input master private key and the path to get child keys? This bitcoin-php library might help: https://github.com/Bit-Wasp/bitcoin-php/tree/1.0/doc But I can't find an example about this.



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