The difference between php version 7 and 5

It has been a long time since PHP7 was officially released. When it first came out, 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 increased several times. So what is the difference between

#php7 and php5?

1. Performance improvement: PHP7 has twice the performance improvement compared to PHP5.0. (Recommended learning:PHP video tutorial)

2. Comprehensive and consistent 64-bit support.

3. Many fatal errors in the past are now changed to throwing exceptions.

4. PHP 7.0 has removed some old SAPI (server-side application programming port) and extensions that are no longer supported compared to PHP 5.0.

5. PHP 7.0 has a new null join operator than PHP 5.0.

6. PHP 7.0 adds a new combined comparison operator than PHP 5.0.

7. PHP 7.0 adds a function return type declaration compared to PHP 5.0.

8. PHP 7.0 adds a new scalar type declaration compared to PHP 5.0.

9. PHP 7.0 has a new anonymous class compared to PHP 5.0.

Why is the performance of PHP7 improved compared to PHP5?

1. Reduced variable storage bytes, reducing memory usage, and improving variable operation speed

2. Improved array structure, array elements and hash mapping table are allocated in the same memory Here, the memory usage is reduced, the CPU cache hit rate is improved

3, and the function calling mechanism is improved. By optimizing the parameter transfer link, some instructions are reduced and the execution efficiency is improved

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