Why is php7 faster than php5?

It has been a long time since PHP7 was officially released. When it debuted, it was claimed to be several times faster than the old version. The speed and efficiency of various open source frameworks or systems running on PHP7 have improved several times. times. So why is php7 faster than php5?

The reasons why PHP7 has higher performance and faster than PHP5:

1. Variable storage bytes are reduced, reducing memory usage and improving variable operation speed

2. Improved array structure, array elements and hash mapping table are allocated in the same memory, reducing memory usage and improving CPU cache hit rate

3. Improved function calling mechanism, by optimizing parameters The transmission link reduces some instructions and improves execution efficiency

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