WordPress "Notice: Undefined index: host" after initial setup running locally on linux

You can define WP_HOME & WP_SITEURL in wp-config.php

define('WP_HOME','http://localhost/project_folder_name');define('WP_SITEURL','http://localhost/project_folder_name');

php linux wordpress

This can also be caused by an error with the siteurl and home options in wp_options table.

Make sure the url's have a host as well, http://example.com not just example.com.

CodeHunter