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This article mainly introduces "the introduction of tcp sticky package and unpacking example in php". In the daily operation, I believe that many people have doubts on the introduction of tcp sticky package and unpacking example in php. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts of "introduction of tcp sticky package and unpacking example in php". Next, please follow the editor to study!

In tcp long link mode, fixed header length is used to unpack messages to solve the problem of sticking packets.

Fixed header protocol

The first N bytes of the message header are fixed as the message length bits. Combined with the business scenario, 2bytes or 4bytes, the message length bits are read first when reading the message, and the message content can be read according to the specific message length.

Pack/unpack can package values to binary / unpack binary to numeric values. For specific patterns, please refer to the detailed usage of pack/unpack. Here, we choose a fixed header length of 2bytes to represent the message body length. The maximum message body length can represent 2 ^ 16-1. If it is not enough, you can go to 4bytes.

Package

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