The Bluehost hosting account must be configured to use a recent version of PHP. After creating a subdomain, I had to delete the .htaccess file to make sure the latest version of PHP was used.
I used the periodic cron method to update my feeds. I used the “twice daily” common schedule. Here’s my command:
/usr/php/54/usr/bin/php-cli $HOME/public_html/www.example.com/tt-rss/update.php --feeds --quiet
The explicit path is required because tt-rss needs a recent version of php meant for the cli (for example, with