PHP Version

You can find it here on the documentation

https://laravel.com/docs/5.7#server-requirements

I suppose to copy and paste the link or answer directly, but i would share with you and the others, the way i check the supported version, so all can save their time waiting for answer and save others time to read these kind of questions again and again:

1. Go to https://www.laravel.com official website and then click on the Documentation link
2. On the top riight corner, select the major version you referring
3. Scroll down to the "Server Requirements" section, you should see the requirement details.