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You can search by yourself also
https://www.sparxitsolutions.com/blog/advantages-of-php7-over-php5-find-php5-vs-php7-difference/
https://www.google.com/amp/s/www.geeksforgeeks.org/php-5-vs-php-7/amp/
https://www.google.com/amp/s/www.arpatech.com/blog/migrate-from-php5-to-php7-in-2017/amp/
Check here. Comparison chart is given:-
https://gbksoft.com/blog/php-5-vs-php-7-performance-comparison/