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Ok I found the answer here. I guess this is official: http://build.prestashop.com/news/prestashop-1-7-is-moving-to-symfony-3-4-and-php-5-6/

Edit 2:

Found better documentation here that just been updated on June. https://devdocs.prestashop.com/1.7/basics/installation/system-requirements/

Ok I found the answer here. I guess this is official: http://build.prestashop.com/news/prestashop-1-7-is-moving-to-symfony-3-4-and-php-5-6/

Edit 2:

Found better documentation here that just been written on June. https://devdocs.prestashop.com/1.7/basics/installation/system-requirements/