(The core ability of senior engineers - reading source code. This course will take you to deeply analyze the source code of PHP7, so that you can fully grasp the principles behind the source code of PHP7, core mechanism, core technology points, PHP extension and architecture design ideas, etc., improve your ability to read and analyze source code, and improve your programming ability And code design ability, let you quickly break through technical bottlenecks, solve performance tuning and high concurrency problems, and easily handle advanced PHP interviews and technical problems.)