PDO Database Class

https://github.com/indieteq/PHP-MySQL-PDO-Database-Class/blob/master/README.md
PDO multi prepare (insert multiple rows with single query): https://www.daniweb.com/programming/web-development/code/495371/insert-multiple-records-with-pdo-prepared-statement

https://code.tutsplus.com/tutorials/php-database-access-are-you-doing-it-correctly--net-25338