Can view HTML and PHP I wrote but install.php returns error
I installed Drupal8 from FreeBSD ports. I don't normally use PHP for anything so PHP version 5.6.30 is what is on my computer so either that is what Drupal used or that's what the port installed. I don't know why PHP7 was not installed instead. 

In FreeBSD, the tokenizer extension is not automatically installed so I added php56-tokenizer and now Drupal8 works.