How to Create Custom 403 and 401 error pages in WordPress – Jesin’s Blog http://jesin.tk/wordpress-custom-403-401-error-page/
wordpress – How do I read values from wp-config.php? – Stack Overflow http://stackoverflow.com/questions/7921229/how-do-i-read-values-from-wp-config-php
Using wpdb to connect to a separate database – WordPress Development Stack Exchange http://wordpress.stackexchange.com/questions/1604/using-wpdb-to-connect-to-a-separate-database
php – Send email using phpmailer on GoDaddy hosting – Stack Overflow http://stackoverflow.com/questions/18858400/send-email-using-phpmailer-on-godaddy-hosting