If you may want to change the URL of your WordPress site.
The function provided by the WordPress developers to change the site url is “update_option”.
Simply add these lines to the functions.php file of your theme:
update_option(‘siteurl’,’http://www.new-siteaddress.com’);
update_option(‘home’,’http://www.new-siteaddress.com’);
Then simply load your site from its new location – it should work just fine.
Note that after you run your site once and you make sure it works you should delete those lines from your functions.php file. The settings are already stored in your database and should not be modified each time your site is loaded.