index.php or setting prblem?

Last week the website is completely fine, today suddenly when I input mian url it only showing:
/** * Front to the WordPress application. This file doesn’t do anything, but loads * wp-blog-header.php which does and tells WordPress to load the theme. * * @package WordPress */ /** * Tells WordPress to load the WordPress theme and output it. * * @var bool */ define(‘WP_USE_THEMES’, true); /** Loads the WordPress Environment and Template */ require(‘./wp-blog-header.php’);

since the site is hosted in folder of /wp, and if check with domson.ca/wp it seems all fine, all files and database checked all fine.
Check any page it comes with the same result.
WP control consle URL checked all fine: wp url is http://www.domson.ca/wp site url is http://www.domson.ca
Not sure why it happens and need help asap