What is the reason why php7 is fast?

#What is the reason why php7 is so fast?

Essentially, it is an optimization of the zend engine, reducing the number of memory allocations, using more stack memory, caching array hash values, parsing strings into parameters instead of macro expansion, and using large blocks Continuous memory replaces small pieces of fragmented memory, etc.

Summary of reasons:

1. The structure that stores variables becomes smaller. Try to make the members of the structure share memory space and reduce Reference, so that the memory usage is reduced and the operation speed of variables is improved.

2. Changes to the string structure. The string information and data itself were originally stored in two independent memory blocks. PHP7 tries to store them in the same memory block, which improves the CPU cache hit rate.

3. Changes in the array structure. Array elements and hash mapping tables will be stored in multiple memory blocks in php5. php7 tries to allocate them in the same block of memory, reducing memory usage and improving cpu cache. Hit rate.

4. The function calling mechanism has been improved. By optimizing the parameter transfer link, some instruction operations have been reduced and execution efficiency has been improved.

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