Why is PHP7 faster than 5?

This article will introduce to you the reasons why PHP7 is faster than 5. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Reasons for performance improvement?

1. The structure that stores variables becomes smaller. Try to make the members of the structure share memory space and reduce references. This way 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.

Why can the performance of PHP7 be improved so much?

• JIT

• Changes in Zval

• Internal type zend_string

• Changes in PHP arrays (HashTable and Zend Array)

• Function Calling Convention (Function Calling Convention)

• Through macro definitions and inline functions (inline), the compiler can complete part of the work in advance

Why is the actual business performance improvement of PHP7 only about 30%?

Actual business does not necessarily have very complex calculation logic

Actual business will use Redis and MYSQL, and network and IO bottlenecks affect the overall performance of PHP7

HTTPS performance issues limit the capabilities of PHP7

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