WordPress 5 Cookbook

How it works...

WordPress provides built-in functions so that we can work with existing database tables for creating, updating, deleting, and selecting data. We already looked at the process of selecting data from the wp_posts and wp_users tables in earlier recipes using the WP_Query and WP_User_Query classes.

In this recipe, we created a callback function on the init action to check the other database operations on the wp_posts and wp_users tables. We started the function by retrieving a URL parameter called wpccp_test and using its value inside a switch statement.

In this case, we are just using the URL parameter to test different database operations on existing tables with hardcoded data. In application development, you will have to ...