Does OPcode caching on by default in PHP 7 ?

I can’t test right now but it is important to me to know if it is, and if not, what is the fastest way to enable it?

Maybe by some PHP CLI command / sed operation?

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On Ubuntu 16.04 you have to install php7.0-opcache by running sudo apt install php7.0-opcache.
You might want to change some settings depending on what you need, check for config options.