What optimizations have been made at the bottom of PHP7?

The optimizations made at the bottom of PHP7 include: 1. ZVAL structure optimization, reducing the occupancy from 24 bytes to 16 bytes; 2. The internal type "zend_string", the structure member variable uses the "char" array, not Use "char*"; 3. PHP array implementation changes from hashtable to zend, etc.

PHP7 underlying optimization

• ZVAL structure optimization, occupying 24 The bytes are reduced to 16 bytes

• The internal type is zend_string, the structure member variables use char arrays, not char*

• PHP array implementation Changed from hashtable to zend array

• Function calling mechanism, improved function calling mechanism, reduced some instructions by optimizing parameter transfer link

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